phoenix1987

iTrader: (3)

I had my car on the dyno yesterday and was kind of shocked at my low numbers. I have long tubes, Ls6 intake, full comp cams valvetrain, underdrive pulley, CAI, tune, no cats, TR230 (230/224 111LSA) and 98 heads. I put down 350rwhp and 350 rwq. I found out the dynojet I used is 10rwhp and 10rwq off. So I am at 360 rwhp and 360rwq. This is through a six speed and a 10 bolt.

I was hoping for 375+. Do these numbers seem low to anyone else? I was told that the short block has around 62K on it. The cylinder walls looked very clean and felt very smooth when I asembled the motor. The car runs very strong and the dyno graph was very consistant. Are the 98 heads that bad? I know some people have had good luck with them cam only, but how bad are they?

I know there has been some porting done to the intake ports, but that is all. I think it was a "port them at home project" by the last owner. My tuner and buddies think that the port job could have made the heads worse. I am thinking so as well.

I am going to put on a set of 2000 heads off of my buddys 2000SS and dyno it again.

98camaroLS1M6

iTrader: (35)

360 is about right with 98 heads and that cam. I would find either some 243s(first choice) or 241s(second choice) to put on for a budget power increase.

phoenix1987

iTrader: (3)

I am going to go with TSP 5.3Ls and a different cam come this winter, it was my original plan. I just thought since my buddy has some 2000 heads just sitting around, I would try them and post them for other people to see.

i think it would be cool to compare 98 heads to 2000 heads with the same set up.

lilbuddy1587

iTrader: (1)

I'd keep the cam and use the TSP 5.3's

phoenix1987

iTrader: (3)

I am thinking about it. I have driven a big cam close to the MS3 and really liked how it puleed on top.

1MEANGTO

That cam sucks........


I tune his car. Tune is good The heads seem to really be holding the car back(the heads have been ported before he bought the engine the port job doesn't look very good and the completely smoothed the runners and the blend job isn't the greatest) It's setup pretty nice otherwise. I've had reverse splits in my own cars before and tuned several and the results are usually the same. I do think we should try fastrepos or my extra heads and see if it will pickup power. I can port them and (they will work) And see where we're at. 98 heads don't have the best exhaust runners and with that cam it just won't work well.

I do think it can make closer to 400 with a better set of heads the car does pull pretty strong.

Like many have said before dynos suck TAKE IT TO THE TRACK...

And for the dyno it is at the least 10 off But maybe more seems to be 20 off but who no's dyno numbers don't really mean crap.

Quit being so bummed out your car goes pretty good.

badpewter-z

iTrader: (4)

id say the heads are probbly worse, espically if the person who ported them doesnt understand the way there SUSPPOSE to flow and not just hog em out like older heads.

my car went 380/370 threw the 9" cam only with the tr230 . as long as the motor is still tight a better set of heads will help alot

1MEANGTO

I am positive that the heads are hurtint the setup. They started to port them then they go to no porting at the valves. So they just ported as far as they could reach.

30th t/a

iTrader: (51)

[QUOTE=1MEANGTO]That cam sucks........


haha, I hope thats a joke. The Tr230 is a great cam and its a proven performer. My buddy with this Tr230 & all bolt ons, stock 2001 heads & LS6 intake went 11.6@120 1.6 60'...tuned by himself using LS1edit (no dyno tune at all ) 3700lbs raceweight. 6 speed too.

TXZ28LS1

iTrader: (5)

how does the reverse split cams suck!! they are proven performers!! ive seen vids of an x1 pulling on an ms3 and a 233/239 from a roll!!! it could be the heads!! i hear the 98's werent the most powerful years to have!! but its still an ls1!!

Stang's Bane

iTrader: (22)

you wil pick up nicely with the 241's.

It is real easy to hurt a set of heads when you port them. Look at Josh's motor, it made close to 400 with that cam sn stock heads.

Keith

phoenix1987

iTrader: (3)

I'm not really bummed, just curious to what others think. I know track times are more important than the dyno. I was just wonderin how bad the 98 heads are.

lilbuddy1587

iTrader: (1)

I wouldn't expect anything stellar from the track with them 2.73's either..

Slowhawk

iTrader: (12)

The heads are probly wrecked.Throw on some other known heads and it will gain alot.Also dump the gears ASAP.

30th t/a

iTrader: (51)

Agreed!!

2.73's!!!...now thats what sucks!

98RedZone

iTrader: (1)

Where do you dyno in mn?

1MEANGTO

I use map's (modern automotive performance in plymouth) dyno to tune Not to prove what power a car makes. The dyno reads pretty low it's been proven a couple times not. But it is a great tuning tool thats all A TUNING TOOL .


As for reverse splits My car (ls1 04 gto) cam only 232/228 and bolt ons went 13.1 with good 60's and good DA's. 3880 race weight.


Now my car ms3 same bolt ons same 60's worse da same track went 12.5 tuned at the same place. Then I started tuning myself car went 12.3 CAM ONLY 3880 race weight.

The reverse split is Hitech motorsports premiere ls1 cam and there tune that they had done several times.They seem to follow tr with their head and cam packages.

So why don't I like reverse splits I'd say the truth is in the track times. I have slips to back this all up. And I have dyno sheets. My car even with the ms3 never had a loss of power or torque when the two graphs we're on top of each other At any RPM

Mr.MartyStone

iTrader: (12)

Reverse splits are junk...and the 98 head rumor isn't that true. I went 418/395 cam only with great under the curve power with "junk" 98 heads. If you look at the setup as a whole then you can get good results. Dump the junky *** reverse split cam.

Marty

Stang's Bane

iTrader: (22)

Reverse splits are made for cars with good/great exhaust systems and not so good intake systems.

Example would be a ls6 intake and lid and then lt/true dual system. If you are not running a relatively good exhaust system on a car with a reverse split, you are suffereing big time.

Luke, what is the exhaust setup on your car??

Slowhawk

iTrader: (12)

1meanGTO -It's obvious the tune on the reverse split was garbage.Thats why the car ran so bad at the track. You wouldn't gain that much on that swap if the tunes were right.

Now,all cars are different.I really hate 98's and never seen one hit over 390rwhp Cam only on our dyno -never!! This is even with the big,bad *** cams.So thats just us.
It's obvious the heads are no good.The home porting probly killed them.