hsr vs fully modded TPI...which is better
#1
Thread Starter
Supreme Member
iTrader: (9)
Joined: Mar 2007
Posts: 1,804
Likes: 2
From: Raleigh, NC
Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
hsr vs fully modded TPI...which is better
i was curious as to which intake would be better
HSR
vs
fully Ported siamesed plenum that accepts a 58mm TB
stock throttlebody with slp airfoil
fully ported and siamesed slp runners
ported edlebrock intake
Adjustable fuel regulator
slp cold air intake
which one of these would make more horsepower...... this would be on a l98 engine of course with a crane 2032 cam....
HSR
vs
fully Ported siamesed plenum that accepts a 58mm TB
stock throttlebody with slp airfoil
fully ported and siamesed slp runners
ported edlebrock intake
Adjustable fuel regulator
slp cold air intake
which one of these would make more horsepower...... this would be on a l98 engine of course with a crane 2032 cam....
#3
Joined: Jul 1999
Posts: 10,947
Likes: 21
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: hsr vs fully modded TPI...which is better
Look at the post in the TPI board "Our quest for a better flowing TPI." That'll give you my results with a fully welded and ported TPI intake and siamesed SLP runners. You'll have to search for results from HSR setups.
#4
Joined: Sep 2003
Posts: 25,779
Likes: 376
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: Strange 12 bolt 3.42
Re: hsr vs fully modded TPI...which is better
its hard to say yet, but i'm leaning towards the HSR cuz of its short straight runners compared to the siamesed curved runners that can approach similar lengths to the HSR
I've seen alot of HSR combos pulling well over 6000 rpms and i havent seen a TPI result yet that makes peak above 6000 rpms.
I'm awaiting one members custom grind dyno results to see where his car will peak. Has made some very impressive numbers by 5000 rpms with a smaller cam, but developed some valvetrain problems. SO with a bigger cam, better springs, i'm hoping it can match the HSR's rev range. that be awesome since there are NO intakes that are emissions legal that can rev beyond 5500-5800 rpms. Superam is the other alternative but still has some problems getting above 5500.
I've seen alot of HSR combos pulling well over 6000 rpms and i havent seen a TPI result yet that makes peak above 6000 rpms.
I'm awaiting one members custom grind dyno results to see where his car will peak. Has made some very impressive numbers by 5000 rpms with a smaller cam, but developed some valvetrain problems. SO with a bigger cam, better springs, i'm hoping it can match the HSR's rev range. that be awesome since there are NO intakes that are emissions legal that can rev beyond 5500-5800 rpms. Superam is the other alternative but still has some problems getting above 5500.
#5
Member
iTrader: (1)
Joined: Sep 2003
Posts: 455
Likes: 0
Car: 1988 firebird trans am GTA
Engine: 5.7L w/hsr
Transmission: 700r4
Axle/Gears: posi 3.23
Re: hsr vs fully modded TPI...which is better
In my opinion and from what i have researched here; it fully depends on what you are going to be doing with the car. if you want a fun street ride with more low end torque and a power curve in the lower rpm ranges, go with the TPI setup. if you are going to be dragging frequently and actually going to be seeing those high rpm numbers, then go with hsr.
Thread
Thread Starter
Forum
Replies
Last Post