who would be the one to talk with thanks

 

i really dont know anything about that stuff and all mine is stock id like to up grade from stock but not to the best something to get it out from the 4500 rpm range thanks

 

Won't really happen until you get rid of the TPI; that is the rev range a long runner intake peaks at
Bigger TPI runners ( and supporting mods ) will make more power but your rev limit won't increase much

This engine had serious mods and still peaked at only 5300 with a heavily modified TPI
https://www.thirdgen.org/forums/tpi/...owing-tpi.html

 

ive read 1-7 on quest for a better flowing tpi so the base would be choice of edelbrock and for the runners would be slp and what about the plenem what to use i didant see anything on that part thanks

 

with the choice of edelbrock base and the slp runners dont know about the plenem right now cam choice is the 12-365-4 how would that combo do thanks

 

Long tube runner style TPI was designed to be a low and midrange high torque production style intake set up. It was designed in the ‘80s to help G.M. V8 cars meet the new emissions and fuel economy standards set by the government.

G.M. was also considering stopping the production of 350 engines in the ‘80s so the TPI set up was originally designed for the 305. TPI had the ability to give the torque of an earlier (late ‘70s style carbed 350) while still meeting the government requirements. G.M. decided to keep the 350 engine in production but didn’t want to spend the money or time to develop a TPI style intake system for the larger engine. They stuck the 305 TPI system on it and changed the injectors from 19 lbs. / hour to 22 lbs. / hour and called it a day. Since the 305 and 350 were in the same relative small block engine family, it was easy for G.M. to have the 350 meet the government requirements. This is why most stock 350 TPI engines have breathing problems after 4500 rpm. The TPI intake system was developed for an engine that was 45 cubic inches smaller.

Most stock style TPI engines are going to make max power around 4500rpm. You can port the intake plenum, at a bigger throttle body, do some airbox intake mods and add an aftermarket base and intake runners. With these kinds of mods TPI should make power to around 5000rpm – 5500rpm. The max torque production should occur in the 3000rpm – 350rpm range.

TPI was never designed to be a high rpm style intake system. Its goal was to make good torque in the engine operating range that most people drive in. Which most of the time is below 4000rpm.

If you want a high winding engine you are going to have to get rid of the long tube runner style TPI and get something along the lines of an LT1 mini ram style intake. This intake will sacrifice some of the low and midrange torque that a long tube TPI has and shift the power range to the upper mid and top end range of the engine.

Also with long tube runner TPI’s they don’t like too much rear gear. With all that low end torque it would be very hard for the car to hook up on the street. Some TPI cars came with freeway 2.7x style gears. The more performance oriented TPI cars came from the factory with 3.2x gears or 3.4x gears. 3.2x and 3.4x gears are more than plenty to get good performance out of a long tube runner style TPI.

With shorter intake runners the engine is going to perform better at higher rpm’s. With this kind of intake you are going to want to pick heads and cam that can take advantage of the extra rpm’s. You are also going to want to consider running steeper rear axle gears (such as 3.7x and up) to get the most out of that set up.

Also if you plan to run an automatic trans you are going to want to have a different torque converter depending on your set up. I’ve got a 2400rpm stall on my car and I am very happy with it. Most TPI engines like stalls between 2000rpm – 2500rpm. Some guys have mods to the long tube TPI and have stalls a little higher than that.

The short runner intake guys often start getting stalls that are around 3000rpm and up. This is to take advantage of the engines increased rev range and get the engine up to that speed quickly.

 

the air box is gutted and have kn filters. what aftermarket base and intake runners would u refur with and i also have 342 gears air foil msd 6al hooker headers ac deleate

 

Accel or TPI specialties would be a better base. The edlebrocks really have to be ported to performe well. They aren't that much bigger than the stock base.

 

ok base accel or tpi ok anything on the runners or plenem any refur on them sry for the Q just would like to get it right so i dont buy anything is not goin to have a set back

 

Sure it's no problem I understand. I had the same questions. I am just saving up money to do the intake mods that I want. This is a place that does ported TPI intakes.

http://www.facebook.com/pages/High-F...62540657151556

You don't have to use them, you could do the plenum porting yourself or have a buddy in a machine shop do it. It should give you a good idea of what to look for.

With the intake runners you have to decide if you want a stock style looking runner or siamiesed style SLP intake runner.

All the intake runners and base mods will increase power all over the rev range. The stock style Arizona Speed and Marine, Accel, TPIS style will give you power in the typical TPI low and mid range region. Power on the top end with improve to.

The siamiesed runners will give you more upper mid range and top end power with a little sacrifice in low end torque. Some people have said they haven't noticed any loss in low speed torque though.

 

the siamiesed runners would be what id want to go with ive got plenty of torque name what the siamiesed runners are i guess i dont get that part

 

would edelbrock runners and base be more upper mid range

 

Edlebrock would be more in the lower and mid range of the powerband.

I really don't like the looks of the edlebrock runners.

 

I know the edlebrock runners are one of the most abundant out there now. I just don't like the way that they look.

You still can get accel and arizona speed and marine. I know with arizona, you will have a long wait time. TPIS stopped listing them on their website.

 

ok so edelbrock is lower to mid what would be mid to upper accel base would it be mid to upper

 

Too bad you don't live in So Cal...we would show you how it's done.

We have a 1/2 a dozen cars with 390-400 to the R/wheels and 6500 plus RPM's.

 

what are they usein to get there is it something u can buy or do u do it idk

 

how are they gettin the mid to upper range im clueless

 

port my stock base or buy aftermarket base

 

This will help you see how it is done.

https://www.thirdgen.org/forums/tpi/...e-porting.html

 

thanks yaj15 and dyno don for the help u have givein its help out a lot