Orange Peel

iTrader: (20)

Nice thread To tell you all the truth, I never knew this stang9050 guy or whatever did any of the AFR vs Dart bashing, so it's nice to know

As for my dyno results, we are shooting for tomorrow morning, I don't mess around The car definitely runs better, it probably has a lot to do with the heads, the fact that I'm not burning more oil than fuel

I did get the 72cc version (I hope, I said that's what I wanted, I got no build sheet with the heads, etc), my setup is as follows BEFORE the head swap, so now the only difference is the AFR 225's, and 7.45 pushrods. I will be installing the 85mm MAF when we dyno....

LS2 402
Eagle 4" stroke forged crank
Callies compstar forged H-beam 6.125" rods
Diamond pistons -2cc reliefs
ARP everything
Dart 225 heads (241 or 250cc after porting), PRC stage 3 port job with 2.08/1.60 valves w/ dual springs
Cometic .051 head gaskets
Fast 90mm intake
Nick Williams 90mm TB
Stock MAF with Screen (85mm MAF going in)
Stock Waterpump
Nasty billet fuel rails with 42lb injectors
Custom Grind Ed Curtis cam 236/244, .629/.629 114lsa
QTP 1 7/8's headers
3" True Duals with 3" Borla XR1's
ASP Crank pulley
Built T-56
Moser 12 bolt with 4.11's
McLeod Street Twin clutch
Denny's Nitrous Ready driveshaft
Racetronix 255 fuel pump kit

I appreciate all the comments and help with the hijack It doesn't bother me, I will post a new thread with the dyno results with a layover of BOTH dynoes to see where it picked up or lost power, etc. I have nothing to hide, so any info or tech support I can give I will

Patrick G

iTrader: (14)

So what was the combustion chamber cc of the PRC Dart heads vs. these 72cc AFRs? I'm just wondering if you're going to be losing a lot of static compression from one head to the other.

gollum

iTrader: (1)

Is porting really needed? I would not port.

Orange Peel

iTrader: (20)

I have no clue what the cc was on the Darts, they didn't tell me, I really didn't know the intake runner volume either, people say they are 241cc or 250cc when they hog them out. But aren't the as cast Dart 225's like 62 or 63 cc? So they may have opened them up to 65-67 cc if I remember them saying something like that.

What do you see my compression ratios being??

Orange Peel

iTrader: (20)

PRC ported them dude, they were their Stage 3 port job with upgraded larger valves.

Patrick G

iTrader: (14)

If the PRC Darts were only 62cc (unlikely), then they would have about 1.6 points higher static compression than the AFR 225s at 72cc. If the PRC Darts were closer to 66-67cc, then you are still losing about 1 point of compression with the AFRs. This is a significant loss in compression, but since you could only run around 18 degrees of timing with the PRC Darts, then you should be able to run closer to 28 degrees with the AFRs. This may give you your torque back. Tuning will be the key for a fair comparison as the compression differences between the 2 heads are great.

DrkPhx

iTrader: (15)

Based on the calculator below and "assuming" your deck height is .007 out of the hole your compression will come in at 10.9. I would verify deck height after removing the DART's. You may want to consider a thinner head gasket. I run AFR 225 72cc heads with a .040 Cometic and .007 deck height which calculates to a conservative 11.3. It would real interesting to see you pick up power if the static compression goes down.


http://www.rbracing-rsr.com/compstaticcalc.html

Orange Peel

iTrader: (20)

Yeah the compression was way too high with the Darts, we couldn't get any timing in the car without it pinging and detonating, and it still got 502rwhp. I'm hoping to be around 11:1 with the AFR's so we can actually get some timing and a more aggressive tune, the Dart tune is VERY VERY mild and on the safe side to prevent it killing itself.

I have the best tuner as a friend so I have no worries about him getting me all the power

JZ'sTA

iTrader: (23)

I doubt the 402 is still 7 thous out of the block. Most builder's aim for a a 0 deck or 5 thous in the hole. (At least around here)
If thats the case (0 deck) then I personially feel there is HP being left on the table if using 93 octane.
You will only be around 10.7:1 and IMO both your DCR and SCR could be much improved for the best power.
With the 62cc darts your CR would have been nearly 12:1 and acturally your DCR looks way better with the 62cc heads.
Anyways this is just my oponion.
Keep us up to date.

Orange Peel

iTrader: (20)

I don't know what they got for the out of the block, and I only have very poor 91 octane gas. So if I get high 10:1's on the compression then I will have a safe motor for this weather and gas. Maybe someday down the road when I have another car to drive everyday, I will throw a larger cam in the car and get some .040 head gaskets to put on. We'll see what she does on the dyno, if it stays the same I will be happy, if I pick up some power, then that will be gravy

JZ'sTA

iTrader: (23)

If you pick up power or even stay the same I would be happy. 500 is no easy misson NA.

ChevPower

iTrader: (8)

If you was getting oil in the cylinder wouldnt this cause pinging and detonation? I have seen cars being dyno tuned and run into detonation they remove the stock pcv and it was gone infact they was able to run more timming.

Orange Peel

iTrader: (20)

The oil will effectively lower the octane rating of the gas, preventing us from adding more timing, and the added compression wouldn't allow it either. So it's a lose lose situation before, hopefully it will be better this go around

2c5s

iTrader: (11)

Actually, my C5 is a AFR and TEA C5. I guess either I win and lose at the same time huh.

C'mon, post up your shop contact info. I'm sure the owner will be thrilled with the press.

SuperSporttruck

iTrader: (2)

I am hoping to see some good results, my 408 looks to be very similar to Oranges 402.

Ksett

This is your last post? You said that the last time!


"The car is an automatic with 3.42 gears in it. not a M6 car. unlocked converter.

Also, I really didnt realize trying to share some results with the ls1 crowd would result in everyone talking crap. I wish I wouldn't have shared anything and wont ever in the future again. I dunno I like the results. this dynojet doesnt put up any killer #'s compared to the #'s I always see posted around here and through a automatic I thought that was a ton of power for a heads/cam on 91 octane only getting 26 degrees of timing (due to crappy ol california gas). Oh well, I will keep to myself and just read..."

Red00

Someone please lock this, another good thread ruined with bs.

SStrokerAce

iTrader: (2)

This thread is one of the reasons professionals stay off of this forum.

Bret

PREDATOR-Z

If it was all professional that would be the only thing you find. Kinda boring.
This is a community forum, with good apples, bad apples and totally roten apples. Still if you sift through, you can have some fine cider matee

Orange Peel

iTrader: (20)

Well, got the car redynoed and tuned, here's the link to the thread....

https://ls1tech.com/forums/showthrea...95#post5102095