jermstyle

Pdd…

With the mods you have, I would be pretty upset too. But without following any of your posts on this issue, I have a couple of questions.

Have you played with the lash any? And who did the tune? Also, have you tried open exhaust and a FIPK style air intake?

That setup ‘should’ be better than 450 really…

Now I’m starting to have reservations about AFRs… hmm

Sweet car and mods though!

pdd

iTrader: (3)

SLOWHAWK did all my tuning i dont know what a FIPK air intake is. i have a vararam intake.

jermstyle

I would lose the 'varascam' and get this...
http://www.knfilterchargers.com/sear...x?Prod=57-3035

Or just some other air intake. The vararam is a good unit for a stock engine, but unless the car is moving, I dont think it really gets enough air.

Just my .02

Also, are you running cats?

pdd

iTrader: (3)

ya im running random tech cats. over on the corvetteforum the vararam is the best intake for the vette

Ben R

Our short-block is almost re-assembled. We're going to be using a stock LS1 short-block with AFR 205CC heads and a small combustion chamber. Static compression will be about 11.8:1. Our dyno numbers and track times will be coming soon.

jermstyle

yea... I know... but I still think a diff intake would help some.

other than that, maybe your tune isnt right on? I just dont see how you arent at the 450 mark with all of the crap on that car.

jermstyle

hey kingcrapbox... don't forget to call me.

max's dad

I'm hoping to have another comparison within two weeks. I'm going from TEA 5.3s, from two years ago, and a TR 230 that made 420rwhp/389rwt. New set up will be AFRs milled .030, Cometic gasket to give 10.7:1 CR, and a 231/237 .616/.613 112 cam with 1.75 RR. Mikey at Rapid Motorsports will retune.
I'm afraid to ask, but any guesses at the numbers?

Ragtop 99

iTrader: (7)

How about strappping on a set of those AFR castings ported by GTP that you posted the flow # and pictures? I'd like to see how those heads perform.

DRM C5

I too will soon have AFR dyno numbers. They will be on a corvette with LG headers (no cats), G5x3 cam on 112 LSA, blackwing, AFR 205's (59cc), and Borla XR-1 exhaust. Right now, my car has LS6 intake with stock throttle body. I may buy a 90mm intake with matching tb.

One thing Mike's posts don't state is whether the AFR heads were 66cc, 76cc, or had milled to a higher compression ratio. That would have an impact on the numbers.

Mike Norris

iTrader: (10)

Hey Guys,

Thanks for the replies here. The folks that are building complete engines with AFR's will not help this situation as I am lloking for complete or partial bolt on dyno as a before and then what RWHP and RWT was gained after the heads nad cam install.

DRM C5,

The heads were milled to 62cc chambers to make the compression ratio in the 11.0-1 area. Do you have any dyno numbers with just bolt-ons before the heads & cam went on or is everything going on at once?

I guess the main purpose of this thread is to find out if 84RWHP and 50RWT is what should be expected or should there be a 100-125RWHP gain? If 84 and 50 is what should be expected, then the numbers I have are fine. If it should be substantially higher like gaining 100-120RWHP and 70-80RWT for just adding AFR heads and their cam, then we have a potential issue. I would not expect them to add 100-120RWHP, just wondering what they should be adding and some dyno to show it.

Thanks.

Mike Norris

Ben R

The short-block we're assembling now is the short-block that we're going to test these AFR heads on. Results will be here shortly! I can't wait! We're not looking for a big peak hp number, but a lot of area under the curve.

Ben R

I'll be giving you a call tomorrow afternoon.

Slowhawk

iTrader: (12)

Sounds like you have another problem other than the heads.Cam is what you ordered?Too much advance will kill HP #'s. Lifter preload?(should be .045 -.080) Vacuum leak? Exhaust? There could be alot of things.

I tuned PDD's car and I'm still impressed with his #'s.It is actually the highest 346ci H/C car that has dyno'd at my shop No magic high HP #'s here

I hopefully will be bolting these on a 380rwhp car soon and do a back to back comparison.

as35thss

Hey Guys,

This is my car Mike is talking about. When I bought this heads and cam. I was told by the sales rep from AFR,that I should see 480 WHP I asked the sales man again. You mean at the flywheel. No he said at the rear wheels. After talking to Mike Norris, I came to realize that 430 to 450WHP was more realistic. I had the car dynoed a week before the heads went on. It dyno at 309RWHP. Which was low to start. My afr was 10.5.1. It was running very rich. We thought it was the SLP mass air flow. It was never tuned the car. The car dynoed at 395.7 WHP and 371.4 WT. A far shy of the 430 to 450WHP we thought was being conservative. I called the sales men and told him I was not happy. He told me to call good or bad, so I did.

We are just looking for some comparasions. Tony did call me back and we talk for a bit. He want's me to have a dyno done at another shop, and check the compression and cylinder leak down.So that is next on the to do list. Don't get me wrong, I am happy with the gains. I am just not happy with the number that where told to me.

Thanks again.

Cary@Perf-Induction

iTrader: (1)

205 is a little hole if you figure out the cross sectional area. I still think a killer 5.3 head will run neck and neck. I've seen a lot of good flowing ports stump the tuners. I've seen some my own good flowing small port heads make smaller numbers than I would of thought. The GM design has a very good combustion chamber design as well as very good wet flow characteristics. The AFR head is also a very good design. I think the hype is a little early, but with other cylinder head shops working with them, they will even come around a bit more. We've been spending a lot of time developing our new cylinder head, and have found a lot of good aspects of the factory heads. They will always be hard to beat, they are already very good. Integrity will be the number one issue. as far as head and cam cars, don't expect to see a huge gain with the AFR heads. You won't see a big difference until the cams get bigger and the carburators or short runner intakes become more popular, just my .02

dand35th

I really don't think the heads are bad.. I just think they will be about 10-15 hp higher then some of the best heads out.. So that is great really, for guys that don't already have a set of heads.. But not so great for guys wanting to upgrade to something in the "next level".. 25 hp would be the min. for me to jump up.. and I can't see that happening for a while still..

next

iTrader: (9)

The peak number really shouldn't matter if the car was low to start. 86 rwhp through CATS just from a set of heads & pulley! I know there's always a lot of hype around a new part and people are wanting the holy grail, but that seems like a really decent improvement. I look forward to seeing what other before/after numbers come up.

TILEMAN

I think a cam was added also, but still a good gain.

next

iTrader: (9)

Somebody wake me up while I'm reading this stuff! Thanks for pointing that out.