I have a tuned port AA4 with TPI. It has 24 psi injectors, edelbrock manifold. It seems to die after 5000. I am either putting in a bigger cam or going to a 383. I was planning on going with stock runners, TPIS bigmouth manifold, 52mm throttle body. Is there anything else I can do to make good power to 7000. Will a custom chip solve this?

 

I dont think the stock runners will go nearly enough for 7000. You might want to save your money that you were going to invest in the TPIS bigmouth and TB and put it into a miniram. Why do you want it to go to 7000? Is that the power band of the cam?

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*1989 RS
*Red, Daytona Turbo fiberglass hood, chrome 16x8 IROC wheels
*355 CID
*TPI ported plenum, SLP siamesed runners, Edelbrock high flow intake
*Edelbrock TES Headers (getting SLP 1 3/4)
*Richmond 3.73, Auburn Posi
*Modded 700-R4, 2800 stall converter

 

The problem is the tpi intake. It will not make power anywhere near 7000 rpm, it doesn't matter if you add all that stuff and larger long tube runners, it will not make power that high. To do that, you should REALLY get a miniram and a big cam to match, and some really good flowing heads.
You will also need a pretty loose converter and 3.73 or 4.10 gears. And if the engine is built right and makes the TQ and HP it should, I'd say a new 700R4 built to handle the abuse will be needed. A chip won't solve the problem, but you will need one after all this.
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89 IROC-SuperRammed 355 w/ AFR 190's and LPE 219/219 cam-http://www.geocities.com/buckeyeroc


[This message has been edited by BuckeyeROC (edited October 26, 2001).]

 

hydraulic roller cams don't like going over 6500.

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-Tas
'89 Formula WS.6

 

Just so you know you already have a tpis big mouth intake.All they do is take a edlbrock and do some port work to it jack the price and sell it as their own port the one you have and it will be the same as theirs.

 

no matter what you do you will not see good hp above 5500rpm's,maybe 6000 but that is a stretch.the ltr design is to long!in order to get what you want a miniram is required aas well as a **** load of parts like hollow stem valves,titanium retainers,a rev kit,a lighter reciprocating assembly,etc.if you build for tourqe the hp will come.

 

Thanks guys. I don't really need it to go to 7000rpm. But I want it to pull past 5000. Because it just seems to die after 5000. To be honest, i'd like to go with carb, but i'm in the military and move alot and don't want a hassle with emmissions. Thanks for the info guys.

 

This what I had to do in order to make power at 7000 rpm:
1. MiniRam
2. Ported AFR 190's
3. Solid Roller Cam, Stainless Roller Rockers, Stud Girdle, Valve springs and Titanium retainers.
My motor now peaks between 6900-7100 rpm. The problem with turning that kind of rpm is that the shortblock needs to be built for it otherwise it will be short lived. The block should be a 4 bolt, steel crank and rods, forged pistons, good oil pump, proper machine work and balancing.
www.geocities.com/dzperf


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D&Z Performance
"Putting Power to the Pavement"

 

HiTech is correct on the "formula" needed to go 7,000 rpm. However, you should add "DFI capable of fuel corrections @ 7,000 rpm" in the shopping basket.

The stock ECM (MAF & SD) can only add fuel up to 6,400 rpm via the PE/WOT tables. After that, the ECM cannot add anymore fuel. With the stock ECM you'll have to either limit your RPMs to 6,500 rpm or set the fuel table to be excessively rich at 6,400 rpm so it can support 7,000 rpm.

So you need a DFI unit capable of giving fuel corrections beyond 6,400 rpm if you plan to make power beyond that rpm level.

 

its silly to hav to go to a solid cam just for 500 RPM, keep the RPMs to where a hydralulic roller cam with maybe a rev kit can handle it.

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-Tas
'89 Formula WS.6

 

You'll need a short runner intake to go over 6500. And I would also suggest going with something other than a 383 if you want to rev to 7000+.

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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 with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)