By the time summer rolls around, I will have installed my Accel TPI Intake Base and my 3.42 rear end. Heads are still a ways down the road, I plan on getting either AFR 190s or 195s, but I won't have the $1500 they cost anytime soon. So I figured I'd get either a set of high flow runners (which ones??) or a TPIS 52mm throttle body with air foil, what do you guys think would do more for my car?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

I say get runners. everyone seems to favor AS&M semi-siamesed runners. They are a bit pricey, but they are the best out there. You could also go for the SLP semi-siamesed runners and do a little port work to them and have a nice set of runners for about $200 less. They also look alot better. I dont think you will need a throttle body for a while though. The guys on here say that it is the least restrictive part of the whole TPI setup

 

I'd say runners. The 48mm TB really supports a lot of horsepower. The runners will allow your intake to flow better. I have the SLP's and like them. I picked them up used for $150, polished them inside and out. You can usually pick up used runners on the board and the best part is they never wear out.

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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Runners. Port the upper plenum and put in an airfoil (bolt-in). The 48mm TB's will support plenty of HP, provided the MAF screens are out and the filters are K&N. In other words, the TB is not a major restriction. New runners will match the base nicely. I think the SLP runners are OK if you can port, or Accel LTR's if you still want a low-RPM powerband. I've also heard AS&M are pretty good runners, but have never used them.

 

I agree, the 48mm TB is good for LOTS of HP, get some AS&M's!!

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Looking For:

87 IROC-Z28 350 TPI: The car I want.

84 TRANS AM 305 H.O.: Another car that would be OK to own while I look for the IROC-Z!!

[This message has been edited by IROCZTWENTYGR8 (edited March 21, 2001).]

 

I agree with Irocztwentygr8.

Get the runners, ESPECIALLY since you have an aftermarket base. You will feel a difference. I would of bought runners, but they would do very little for me, my intake manifold is still stock. Go with AS&M!

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton 10# SN92 polished kit, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,stock chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

What is the powerband on the AS&M's?
I want some low rpm torque, but basically a little of both. What is best?

 

The SLP runners can be siamesed to shorten the runner length and extend the plenum volume. E-mail me if interested and I'll send some pic's of how I did my runners and plenum. It helped on the top end, and I plan to extend the siamesed section further when I remove them to help my friend who is buying them.

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87 GTA, auto w/2100 stall, 3.27 rear, L98 .020 over,Comp 269HR cam & 1.5 roller tips, ported heads, 52mm TB & airfoil, siamesed SLP runners, port matched plenum, ported intake, Edelbrock TES, AFPR, MSD 6A/Blaster coil, MAF screens, cold-air induction, heated O2, Ed Wright Fastchip.
Soon: ported/polished: Super Ram, Accel intake, Sportsman II's w/1.6 rr's - & burning my own proms.

 

Definately get the runners for all the above reasons.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association