Summers6920

Hey guys i took my stock 98 Z28 in today for a couple dyno runs and my max horsepower was 301 and 305 Torque. Kinda seems low. Whats your guys thoughts?

HCI2000SS

iTrader: (2)

Seems about exactly where it should be IMO. Maybe a tad low on the torque though

MikeWS6

Looks good. Most 98s I've seen are 285 to 300.

HCI2000SS

iTrader: (2)

Yeah now that I think about it a little more his numbers are pretty good actually, considering it's a 98. Wonder if it's an auto or manual

Summers6920

The car is a M6 so i imagine that helps. I want to get to 420HP at the rear wheels so i was thinking head and cam swap should get me there. what do u guys think?

MikeWS6

228R, ported 243s, ls6 intake, ported tb and full exhaust should get 420ish

HCI2000SS

iTrader: (2)

Funny thing about dynos...with mods in my sig my car made 405 rwhp on one dyno (when I got the car) and 460 rwhp on another dyno when the previous owner had it. Bottom line...don't hold out for a particular number on a dyno

thebird00

I've been looking at adding a volant cai. Does anyone know about how much power that would add? Also, would I need to tune the engine afterwards or would I be fine without tuning?

Summers6920

Why do i always see people recommending the 228rtime cam. Could i go more aggressive i mean something like 243/238 112

HCI2000SS

iTrader: (2)

You can always go with a more aggressive cam, but it may not be any faster (maybe even slower) than a smaller cam setup that makes better power under the curve.

Alex L.

iTrader: (16)

My 98 made 315/331 with cold air and catback 14 years ago. I would say your car would probably beat that by a bit.

MikeWS6

The 228 is good for drivability. For a street car I wouldn't go much bigger.

Summers6920

Why do i always see people recommending the 228rtime cam. Could i go more aggressive i mean something like 243/238 112

Summers6920

How big can i go i dont mind losing some driveability. Sorry about the same post twice my computer has been acting up all day

lemons12

iTrader: (71)

Set up properly, two cams that are that much of a variation, the larger cam would always be faster.
Don't worry about how big you can go, worry about what would work best.
To answer your question... Ms4/Polluter/Trex/etc..
Aftermarket lid and a Chrs1313 ram air will make more power than that.

Not tune needed.

Summers6920

So i was looking at custom grinds for cams and was wondering what grind yall would recomend

lemons12

iTrader: (71)

More info needed... Plans for setup... Supporting mod list... Etc etc etc... How/when you drive the car... ET/power goals.. Etc... You can't even begin to spec a cam for something you know nothing about.

Summers6920

Ok well its a dd but i have no problems with a high hp dd. So the current plan is AI ported stock heads a cam a ported throttle body ported intake bigger injectors 1 7/8 long tube headers. And eventually a bottom end rebuild down the road.

Summers6920

The car will mainly be used for fun and driving to work. Also some track time ocassionly also some 4.10 gears to add to the parts list

redtan

iTrader: (5)

Considering that the car is "rated" at 305hp and 335tq, I would say getting ~300 at the wheels is pretty darn good.

Seeing as how technically the LS1 is rated at 345/350, your results indicate some 15% drivetrain losses, which is right on par with the z28 drivetrain.