FIRST intake throttlebody conversion (completed with pics)
#1
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
FIRST intake throttlebody conversion (completed with pics)
well guys it looks like this throttlebody that came with the FIRST is giving me too many problems..... so im getting made a conversion plate to use the stock 48mm throttlebody onto the first... i never like the design of the FIRST throttlebody, there arent many vac lines on it, the iac is under the plenum making it near impossible to reset the iac without removing the throttlebody, the lame tps bracket design and mount.... for whatever reason i cannot get this TB to act right... the stock gm one never gave me problems so i will just use that with an airfoil..... i will post pics of the conversion soon...
Last edited by 88fastgta; 10-23-2011 at 02:10 AM.
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Car: 09 GSXR/88 iroc/91 RS B4C
Engine: 600cc/l5.7/5.7
Transmission: 6 speed/TH 350/auto
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Re: FIRST intake throttlebody conversion
Don is doing the same thing. not sure how far along he is on the progress but im sure he can be helpful
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Re: FIRST intake throttlebody conversion
If your going thru the trouble to make an adapter etc. why not convert to a LSx style since its similar to the round mono-blade of the first also?
#5
Re: FIRST intake throttlebody conversion
In to see the finished product
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
i tried the ls1 route but like previously mentioned before its alot more involved with the first intake... so the adapter plate will convert any tpi, lt1 throttlebody to adapt to the first intake system... i just like the GM's design much better and it never gave me problems.... i will be using a 48mm throttlebody with an airfoil... im going to have the throttlebody shipped off for a complete rebuild... im almost willing to bet that it will perform alot better... The throttlebody never was the restriction of the LTR tpi setup...
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
plus this will also make the first look alot more like the factory unit... the throttlebody of the FIRST is vastly different and was the huge giveaway that something "was up" with this intake...
#9
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
the problem is that the throttlebody is sticking a little bit and i tried three different types of throttlebodies and they all do the same thing... im guessing its a design flaw but for whatever reason i cannot get it to act right, plus as mentioned before i dont like the iac port under the plenum and the flunky tps mount design and just the arm linkage setup.... i never had sooo many problems with a throttlebody before so why not convert to a throttlebody i never had problems with...
#10
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Re: FIRST intake throttlebody conversion
the problem is that the throttlebody is sticking a little bit and i tried three different types of throttlebodies and they all do the same thing... im guessing its a design flaw but for whatever reason i cannot get it to act right, plus as mentioned before i dont like the iac port under the plenum and the flunky tps mount design and just the arm linkage setup.... i never had sooo many problems with a throttlebody before so why not convert to a throttlebody i never had problems with...
I do like the idea of adapting the dual t/b to make it look more stock. I had measured the plenums and it looks like you could cut off the mount for the FIRST and from a stock plenum and it would weld on to the FIRST without too much trouble.
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Re: FIRST intake throttlebody conversion
"I do like the idea of adapting the dual t/b to make it look more stock. I had measured the plenums and it looks like you could cut off the mount for the FIRST and from a stock plenum and it would weld on to the FIRST without too much trouble."
...or get some 1/2 to 3/4" thick aluminum stock and make your own plate by welding it on to the First plenum. You may or may not want to cut off a little of the First plenum before welding on the bar stock. Really not that hard to do.
Edit: Look on page 5 post 245 of this thread. https://www.thirdgen.org/forums/tpi/...-runner-5.html
It shows an extension plate I made for the plenum. It could have easily been used for what you want to do. It is 3/4" thick. It is for a monoblade but could have two holes 58mm in diameter for example. The through holes could easily be 8mmx1.25 threads.
...or get some 1/2 to 3/4" thick aluminum stock and make your own plate by welding it on to the First plenum. You may or may not want to cut off a little of the First plenum before welding on the bar stock. Really not that hard to do.
Edit: Look on page 5 post 245 of this thread. https://www.thirdgen.org/forums/tpi/...-runner-5.html
It shows an extension plate I made for the plenum. It could have easily been used for what you want to do. It is 3/4" thick. It is for a monoblade but could have two holes 58mm in diameter for example. The through holes could easily be 8mmx1.25 threads.
Last edited by 1989GTATransAm; 10-23-2011 at 07:03 PM.
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Car: 1987 Trans am GTA
Engine: D1sc 383
Transmission: t56
Axle/Gears: 4.11
Re: FIRST intake throttlebody conversion
88fastgta,
i just watched you TB sticking video on you tube. Thats odd for it to be sticking to that extent.
This is a new one sent from FIRST?
My rpm hangs, but not like that, mine may be more of an issue with a sticky IAC unit.
I run no return spring, and it closes against stop with no issues, I suppose in my case the small spring on the other side, along with TV cable supply enought return force .
Have you checked for the washer in between the bracket and bracket mounting boss? There should be one that works as a spacer so the bracket does not bind against the mounting surface.
Worth a look.
i just watched you TB sticking video on you tube. Thats odd for it to be sticking to that extent.
This is a new one sent from FIRST?
My rpm hangs, but not like that, mine may be more of an issue with a sticky IAC unit.
I run no return spring, and it closes against stop with no issues, I suppose in my case the small spring on the other side, along with TV cable supply enought return force .
Have you checked for the washer in between the bracket and bracket mounting boss? There should be one that works as a spacer so the bracket does not bind against the mounting surface.
Worth a look.
Last edited by gbayfisher; 10-29-2011 at 08:53 PM.
#13
Re: FIRST intake throttlebody conversion
I noticed that the spring is hooked up different than mine. Maybe u should try moving it. I tried to post a pic off my phone but can't. If someone pm's me i'll send them a pic. So u could post it
#15
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Re: FIRST intake throttlebody conversion
Yep,, I had my t/b spring attached just like 1rolmos. I looked at the "Official FIRST Thread",,,, I know that's how FIRST shipped it,,, but I'd suspect how you have your spring mounted is "the problem".
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
sorry guys for getting back soooo late....hmmmmm.... i have never tried that position... so i will try that out.... put gbayfisher yes the washer is there and everything i dont whats going on... all my cables easily reach and have no bind in them.... but i will try the position like the guy posted and see what happens from there..
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
one problem though i have my throttle cable hooked up to where 1rolmos spring is at.... idk guys i just really dont like the throttle body design..nothing against FIRST performance or anything.. i know its not the spring because it binds with the throttlebody off the car and with everything else not attached to it..... i have done numerous tests to rule out my cables, iac and the spring itself... i just want the stock throttlebody on there... this is too much work to get something sooooo simple to work right... i never thought once about my stock tb and thats how it should be....
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Car: 1987 Monte Carlo SS
Engine: Vortec headed 350
Transmission: '89 WC T5
Axle/Gears: 3.73
Re: FIRST intake throttlebody conversion
I agree, the FIRST throttlebody leaves alot to be disired. I have yet to run my FIRST intake system, but the TB definitely stuck out as something that seemed underbuilt to say the least (IMO). The linkage seems sloppy(I added a nylon washer to take some of the side-side slop out) and the TPS mounting seems like an after-thought(?)
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
hmmmmm... i never thought of that....but the FIRST's plenum is alot better and overall bigger and longer and doesnt have all the restrictions like the gm plenum has........ would be cool though.... then it would really look stock...
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
update guys... i should have it done before the end of the month.... i just bought a 48mm throttlebody that has been rebuilt and a nice custom plate.. i am going to semi polish the throttlebody when i get it also i want to cut off all the ports like the coolant passages etc and weld them up to give it a nice clean look... i think this throttlebody will look WAY better than the FIRST
#23
Re: FIRST intake throttlebody conversion
I had a little issue with mine hanging too but it was due to a lock nut on the side being cranked down a little too tight. I backed it up a turn and now things are much happier. If i had seen you were looking for one earlier I had the old one off my vette which I think would have saved you the air foil.
I'll agree the FIRST throttlebody required a little too much rigging to get it to work but I think it's going to work well.
I'll agree the FIRST throttlebody required a little too much rigging to get it to work but I think it's going to work well.
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
well i got my throttlebody yesterday... i started semi polishing it and i cut off the coolant passages near the iac to give it a nice clean look since im not going to let coolant flow through the throttlebody.... its looking ALOT better already than the FIRSTs TB.... i will post pics later this morning.... im also waiting for my custom plate to come in....
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
so my throttlebody went from this
#26
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
to this (sorry pics taken from camera phone) has ALOT more shine to it in person....
Last edited by 88fastgta; 11-14-2011 at 10:08 AM.
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
im still waiting on my plate to go on top the of the throttlebody as well...
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: FIRST intake throttlebody conversion
Here is what I was working on:
#29
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Car: 1988 Flame Red Trans am GTA
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Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
I see a lot of people want to get rid of the firsts TB... that's looking good dyno Don... which throttle are you trying to adapt... it looks like I have to drill and tap the Plenum to make a 3/8 port so my drivers Side valve cover can get vacuum all the time since there is no port on the firsts base like the stock base has...hopefully my project will be done by the end of this month..
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: FIRST intake throttlebody conversion
You just need to notch the back of the throttlebody where that triangle hole is.
Put a 1/4" notch on each side into the bores to let vacuum into the IAC hole like the '89-92 is.
Put a 1/4" notch on each side into the bores to let vacuum into the IAC hole like the '89-92 is.
#31
Re: FIRST intake throttlebody conversion
Here's a pic I came across. Looks pretty nice.
Scroll down for it. https://www.thirdgen.org/forums/powe...ngle-60mm.html
Scroll down for it. https://www.thirdgen.org/forums/powe...ngle-60mm.html
Last edited by 1rolmos; 11-14-2011 at 10:39 PM.
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Car: 92Z28, 99SS, 83Z28 & 86GTA
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Re: FIRST intake throttlebody conversion
Here's a pic I came across. Looks pretty nice.
Scroll down for it. https://www.thirdgen.org/forums/powe...ngle-60mm.html
Scroll down for it. https://www.thirdgen.org/forums/powe...ngle-60mm.html
#33
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
just a little update... got my custom plate today.... here are some pics.. (sorry for the lousy camera phone quality).. once i get my adapter plate i will most likely sell my FIRST throttlebody for anyone who is interested in it....
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
The throttlebody adapter is done... i will post pics soon... so now im able to use my stock throttlebody on my first Intake...
Sorry for the long delay I have been busy and buying a truck ...
Sorry for the long delay I have been busy and buying a truck ...
#37
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Car: 1988 Flame Red Trans am GTA
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Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
Oh I will.. you guys are gonna like this...
#38
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Car: 1988 Flame Red Trans am GTA
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Re: FIRST intake throttlebody conversion
as promised my adapter.....
#39
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Car: 1988 Flame Red Trans am GTA
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Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
more pics of the adapter plate
#41
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
thank you... the cable bracket is bolted onto the FIRST's plenum, so no modding on that..with this adapter mated to the stock throttlebody its about the same length as the FIRST's throttlebody, so no lengthening the cable are required... this is a simple bolt on now with this adapter plate...
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Car: 1987 Trans am GTA
Engine: D1sc 383
Transmission: t56
Axle/Gears: 4.11
Re: FIRST intake throttlebody conversion
Looks good.
If it was mine, I would round the edges off, or even follow the contour of the TB.
Looking forward to seeing it on, and i hope it solves your issue.
Never mind .... I guessl plate matches the size and shape of the intake plennum!
If it was mine, I would round the edges off, or even follow the contour of the TB.
Looking forward to seeing it on, and i hope it solves your issue.
Never mind .... I guessl plate matches the size and shape of the intake plennum!
Last edited by gbayfisher; 03-08-2012 at 07:46 AM.
#43
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
i will post pics hopefully this weekend installed on the car... i know this will fix my issues.... the stock TB never gave me problems..... i just never like how the throttle cable mounts, tps and iac how mounted on the FIRST... not to mention the whole FIRST TB just gave me sticky throttle issues
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Re: FIRST intake throttlebody conversion
You should send those pictures to Ken at First and let him see how its done. It actually might help him sell more units if he had that adaptor in being able to use ones own throttle body. When I was thinking of doing it I was going to just weld the adaptor plate to the front on the plenum. However your way is better for most people.
#46
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
You should send those pictures to Ken at First and let him see how its done. It actually might help him sell more units if he had that adaptor in being able to use ones own throttle body. When I was thinking of doing it I was going to just weld the adaptor plate to the front on the plenum. However your way is better for most people.
actually 1989gtatransam.... ken was the person who designed it for me lol..... it took him a while because he said he was backed up on orders and had alot of work to do... i told him ok because i have a ford ranger that i daily drive so i told him no rush on the product..... when i got the adapter this is what he told me in the e -mail
" There is a lot of hand work involved with this as you will see when you receive it. It is very time consuming and I will not make another for anyone else after this for sure"
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#49
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Car: 1988 Flame Red Trans am GTA
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Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: FIRST intake throttlebody conversion
Ken would get alot more business if he had made these on the side for people like a 100 dollar add on price or something.... but i guess there are not enough people to make the adpater in production....i feel sorta special that ken has made me a custom peice just for me.. its definitely a piece of work.... i wonder if dyno don has finished his adapter plate
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Car: 1987 Trans am GTA
Engine: D1sc 383
Transmission: t56
Axle/Gears: 4.11
Re: FIRST intake throttlebody conversion
Ken would get alot more business if he had made these on the side for people like a 100 dollar add on price or something.... but i guess there are not enough people to make the adpater in production....i feel sorta special that ken has made me a custom peice just for me.. its definitely a piece of work.... i wonder if dyno don has finished his adapter plate
I only wish he had help to roll out new products sooner and quicker, ei; 2inch runner, siamesed runners, plates as in your case. I feel he should make this plate available.
Last edited by gbayfisher; 03-10-2012 at 07:46 AM.