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HELP....my so called performance slug

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Vette Obsessed:

--- Quote ---Originally posted by daniel42au
Are we talking about the same thing?
 
--- End quote ---


Knowing Boschvette, I'd say the answer to that question is YES. ;46 ;41

87Z51:
"he found my L98 was puting out the same HP as when it left the factory.... about 160 flywheel hp"

Should that not be RWHP?
 stock L98s come from the factory 240- 245 flywheel Hp.

" share with us what you have done to get 400 RWHP out of an L98?"
Well it was a L98 once until he made it a 383 with miniram

"would like to improve without expending too many bucks for the bang".

From the weight v ET mine is making approx 320 at the flywheel.
Have ZZ4 cam , siamized stock unported base , SLP big tube runners and a home ported plenum with headers.(100K heads never been off)
Running  the stock TB v a 58mm made no difference so save your money
Can only go so far with intake mods until you need a cam.

Best bang for buck is headers and a hi flow cat.
Then freebie intake mods ;siamized base works wonders without the big tube runners ,then a cam.

ZZ4 cam is nice  can be had for under $250Au ( v $500 for a TPIS cam) and was fitted to ZZ4 crate engine which is a L98 with a carb rated at 355Hp  so factory proven combo.
Will lose a little with TPI intake even modded like mine
Need to upgrade valve springs to suit cam ZZ4 / LT4 ones are cheap also.

"My L98 has not gone over 4000rpm"
time to  put you foot down ,stock will make power to 4500  before it drops off.

Next?

daniel42au:
thanks for that.

yes, your quite right... 160 rwhp is what i meant.

maybe one can never have too much power... and it is only limited by the thickness of one's wallet.

as for me, I am in the process of making some fairly modest improvements... 1.6 gm roller rockers, SLP runners, BBK 52mm throttle body(the original was worn out), hei(?)ignition coil, and a stage 2 transgo shift kit.

I had replaced the original mufflers which were rusted out with a pair of magnaflow mufflers but being in QLD i enjoy driving with the top down too much and the increase in noise got to me so I subsequently replaced them with a pair of stock mufflers from corvette central.

87Z51:
To optimise the 52mm you need to spend 1/2 hour with a die grinder removing the EGR ridges in the plenum behind the TB.

1.6s are a good mod but won't gain you much on the stock whimpy   cam.
Will only take you out to .430 / .450 lift  where as a stock LT1 cam alone is .447/.459 with 1.5s.
ZZ4 cam gives you .474 / .510 with stock rockers.
Great increase in power with nice street manners.
or match the 1.6s up with the proven Hot cam to get .525 /.525

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