prc guys your wait is over
i was thinking about going with this setup, But i don't have the Fast intake or the pulley...any idea what kind of number's i'd be making?
any sound clips? I wanna hear what she sounds like!!
any sound clips? I wanna hear what she sounds like!!
You spent a lot of money for 20hp... You would have probably been close to that with just the 90mm Intake and TB
just let me and gomer **** this mule we can handle it
just let me and gomer **** this mule we can handle it
Originally Posted by BAIN
Looks like locked #'s to me 
In this thread Gomer said that it was locked. The lack of a torque spike also indicates it was locked.
Originally Posted by gomer
I'll try to graph the before's and after's against each other today. He gained 26rwhp at peak and almost 35rwhp at the end of the pull. The past three cars I've done with FAST 90 setups have gained around 10-12rwhp, so I'm thinking the cam gained about 15 or more.. since his previous heads were milled .020 and the ones I put back on there are unmilled. He sold his old heads, old cam, LS6 intake.. and got a hell of a deal on install, so he didn't come out too bad 
i agree with your assessement of cam and 90/90 gains, that pretty much accounts for the peak to peak and past peak gains. whats the chamber volume of the new head? from my rough guestimations he lost .4 of a point of compression. where does the gain from the new heads come in if any? are the valves the same size as the old set; 2.04/1.585?
On The Tree
Joined: Sep 2005
Posts: 101
Likes: 0
Originally Posted by jrp
you find the graph yet?
i agree with your assessement of cam and 90/90 gains, that pretty much accounts for the peak to peak and past peak gains. whats the chamber volume of the new head? from my rough guestimations he lost .4 of a point of compression. where does the gain from the new heads come in if any? are the valves the same size as the old set; 2.04/1.585?
i agree with your assessement of cam and 90/90 gains, that pretty much accounts for the peak to peak and past peak gains. whats the chamber volume of the new head? from my rough guestimations he lost .4 of a point of compression. where does the gain from the new heads come in if any? are the valves the same size as the old set; 2.04/1.585?
none the less, just wish there were less changes in between to quantify, but I have never been to a cheap dyno yet... LS1 Tech Stories
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You have any time slips yet Mark?
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Originally Posted by jrp
you find the graph yet?
i agree with your assessement of cam and 90/90 gains, that pretty much accounts for the peak to peak and past peak gains. whats the chamber volume of the new head? from my rough guestimations he lost .4 of a point of compression. where does the gain from the new heads come in if any? are the valves the same size as the old set; 2.04/1.585?
i agree with your assessement of cam and 90/90 gains, that pretty much accounts for the peak to peak and past peak gains. whats the chamber volume of the new head? from my rough guestimations he lost .4 of a point of compression. where does the gain from the new heads come in if any? are the valves the same size as the old set; 2.04/1.585?
I didn't cc the chambers on these heads, but I'd guess they are slightly larger than stock 5.3 chambers because of material taken out when the chambers are CNC'd and also from the material when the valves are unshrouded. I don't think there was very much gain from the old to the new heads, they have the same 2.04 intake valve, but the exhaust is a Ferrea exhaust valve. These were unmilled because I didn't want to flycut Mark's pistons to run the larger cam and we sold his old heads for a good price. The car did 400rwhp before with the higher compression, more aggressive tune, and a smaller cam.. I was expecting around 420rwhp with the lower compression, larger cam, FAST 90 setup, and the rich tune with lower timing.. so it actually turned out a little better than I was expecting.
I thought you guys were taking this thing racing! Where's the slips???
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Originally Posted by Jason 98 TA
I thought you guys were taking this thing racing! Where's the slips???
I don't have a way to get any sound clips and I've already delivered the car back to Mark, he lives about 3 hours away from my shop.
Originally Posted by gomer
Mark is going Thursday night. He'll have some slips then.
I don't have a way to get any sound clips and I've already delivered the car back to Mark, he lives about 3 hours away from my shop.
I don't have a way to get any sound clips and I've already delivered the car back to Mark, he lives about 3 hours away from my shop.
Which track will you all be going to?
John
Originally Posted by JNorris
Which track will you all be going to?
John
John
Very good results.I dynoed my car before I had my 90/90 set up put on and then right after.I picked up 10rwhp/10fpt,just about what Gomer's results show on a heads cam car.
I then had the car retuned and saw the same 10/10 but much better drivability.
I then had the car retuned and saw the same 10/10 but much better drivability.
Very nice numbers for an A4. It will run hard at the track. As stated above by JFM he only gained 10 hp from the 90/90 swap on a h/c car. I think the m6 cars are the only guys getting 20+ hp from this swap.