I am about to buy a TPI setup and get rid of my Carb setup. Just wondering if the TPI manifold will bolt to my stock heads on my LG4 motor.
Also, will I have to do any modifications to my fuel lines? I am also getting a fuel tank with pump and sender, those should bolt up fine, right?

Thanks,
email me if possible.
zepher@sybercom.net



------------------
Zepher
'86 Pontiac Trans Am WS6, LG4 305, 5 Speed, CF DF Clutch,
Edelbrock 1406 Carb, Edelbrock Performer RPM 7101 Intake Manifold.
Edelbrock Open Element Air Cleaner: Flowmaster Exhaust, 160* Thermostat,
Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Leather 96 Camaro SS Seats,
Alpine CD+Changer,Alpine V12 Amps, Premier TS-1040C Subs, Polk Audio highs/mids.
Best ET: 14.94@91.67
High Speed Run: 157mph
WS6 Trans Am

 

Depends on the year of the TPI manifolds. I put 85 manifolds on my '87 LG4 and I had to elongate the center four bolt holes to make it work.

You will need different fuel lines. I gutted all of the stock fuel lines out, and ran factory fuel lines. I bought them used from a wrecked car for $20. You don't need the whole gas tank, just the sender, and for pete's sake, put a new pump in.

I did the exact same swap (on an '87, see sig), so feel free to ask.

------------------
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GM Master Tech
ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Can I break into my stock LG4 lines and use them? I was going to mount an in-line pump and filter under the car and just break into and move the lines. Any reason why this would not work?

Many thanks.

 

I'm pretty sure that the fuel lines in a TPI car are larger. Someone else on this board should be able to confirm that. I have also read that an inline pump is not recomended as the primary pump for a F.I. application. It should only be used to supplement an in-tank pump if you need more pressure or fuel flow.

------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

Like what was mentioned above, you will want to purchase an 85-86 base-plate manifold, to be a direct bolt-in. 87 up will work, just have to modify the center bolt holes to line up. Sorry, don't know about the fuel lines, but you do want to go with a NEW pump in the tank.

------------------
Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.

 

zepher,
you probably have three fuel lines coming to
your fuel pump. the return line shold really
be 3/8" if you are going to do some racing,
or high rpms. 5/16" is ok, but could make some
probs later (running rich). this is how tpi
gets a bum rap because of the conversion
isnt complete. if you are running the stock
tpi harness, then consider either a chip or
VATS bypass. the burner can remove the VATS
command.
the 85/86 manifolds will bolt directly. 87/92
will have to be modified. are you still going
to run the MAF or change to a speed density system?
airdeano

 

I wouldn't recomend using the carb lines, since 25% of them is low pressure rubber. They also enter the engine bay on the wrong side. I only paid $20 for the entire length of fuel lines from the sender to the engine bay, including the two flex lines (which I didn't use anyway, since I used a Vette fuel rail).

You can use an inline pump, I know several people who did, but if you are going to drop the tank, I would go ahead and put a Walboro or something in. you can re-use the carb fuel tank (they are all the same) but you will need the F/I fuel sender if you are going to use the F/I fuel lines. V6 and V8 lines will both work.

------------------
FREE CARFAX Record Check

If you live in Southeastern US, check us out!
South East Thirdgen

GM Master Tech
ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
3.73 Posi
4wheel Disc Brakes
Summit 1-5/8" headers, 2.5" Dynomax catback.

Best 1/8: 9.519@72.74

'97 Bonneville SSE

 

Well, right now I am going to be using the MAF setup and try and get the car running.
I installed a Holley inline high pressure fuel pump and changed all the low pressure fuel lines with high pressure lines.
I just need to get a couple more connectors, like the MAT sensor wire.
I have been procrastinating for a couple of months now, need to get working on it.


WS6 Trans Am.

View My Ride @ thirdgen.org

 

Zepher,

Hey man I come down to the tidewater area every here and there for work, nice area! I have a buddy up here who deals alot with parting 3rd gen f-body's, primarily the birds. Let me know if you end up needing something and I will check with him to see if he can hook you up.

 

Cool,
shoot me an email sometime when you are coming down, we can get together and shoot the **** down at Hooters on Military Hwy, I know a bunch of hotties that work there.

 

I have a "how I did it" on my web site conversion from LG4 to TPI, check it out, might answer lots of questions for you. If there is some question that I could help you with, e-mail me. I havent been around for a while due to work.

Go to http://www.3rdgenformula.com after the spash screen scroll down about half way on the main menu page and find "Modifying your Formula" You will find my journal in there on how I did the surgery.

------------------
87 Formula Yellow/Black
Engine & Transmission
.040 over 5.0 converted to TPI, 9.5:1 Compression, SLP Cam Dur 206/212, Lift 480/487, Cent Line 112, SLP headers, SLP cat-back exhaust, K&N Airfilter, Modified Stock cold air intake, Ported & polished Stock TPI intake, Holley Adjustable Fuel Press regulator, AC Rapidfire Spark Plugs.
Gil Younger (no yo-yo) Shift Kit, Aluminum Driveshaft, 3.73 Posi gear
Suspension & Brakes:
Baer 12" brakes 4 wheels, KYB AGX Adjustable Shocks & struts, Hotchkis strut tower brace, South side machine frame connectors, Custom reinforced control arms and pan hard bar.
Interior:
Custom Leather interior, CUSTOM Yellow Gauge Faces, Kenwood Receiver, Pioneer Speakers, Kicker Substations, Kenwood 10 Disk Changer, Pioneer Amp.

87 Formula TPI (5 Speed) Yellow/Gray STOCK

1967 Buick Riviera 430hp Turns high 14's (Not bad for 4300 lbs)

83 Camaro (Parts)
83 T/A (parts)

http://www.3rdgenformula.com

 

a 85-91 corvette tpi manifold will bolt right up to your stock heads

[This message has been edited by u r sofa king we tah did (edited July 30, 2001).]

 

Sounds like a plan bro, will do. How is the conversion coming along? I was at the local pick and pull the other day and they had an 84' TA that had an LG4 that was converted to TPI. It looked pretty well done, they even swapped in the serpentine system and late model harness. (88+, different relays) It still had the cold start injector on it and was hooked up though, and was a MAF system. I grabbed the whole TPI system with ECM, but not the harness. I just did not have that kind of time, well that and they charge by the foot! They already kinda charged me about 3x more than what I was figuring on. Let me know if you are missing anything or need a clue, I can check that one out as it should be there for a while before they crush it...