402 results
402 results I just recently swapped out cams in my 402 from a tsp ms3 cam to a custom ground cam. My specs are
1998 z28
ls2 402 with -14cc dished pistons
afr 205 heads milled .030
242/244 cam
ported 90/90
1 7/8 kooks headers with a catless y into a gmmg exhaust
built a4 with a 3600 stall and 3.73 gears
The car was also retuned with speed density
Here is a graph with both of the cams.
What kind of gains do you think there is by swapping out the afr 205's for a bigger set of heads.
1998 z28
ls2 402 with -14cc dished pistons
afr 205 heads milled .030
242/244 cam
ported 90/90
1 7/8 kooks headers with a catless y into a gmmg exhaust
built a4 with a 3600 stall and 3.73 gears
The car was also retuned with speed density
Here is a graph with both of the cams.
What kind of gains do you think there is by swapping out the afr 205's for a bigger set of heads.
[QUOTE=venom ws7]Damn man 31rwhp from cam swap that custom cam must be huge.
My cam specs are 242/244 .610”/.612” 112lsa which I would consider it to be a decent size cam, but I have seen cams alot bigger going into 402's. The problem with my old ms3 cam is that its made for a max effort 346 block.
My cam specs are 242/244 .610”/.612” 112lsa which I would consider it to be a decent size cam, but I have seen cams alot bigger going into 402's. The problem with my old ms3 cam is that its made for a max effort 346 block.
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If I were you I would be pretty happy with the results. The hp/tq curves are perfectly smooth and the old ones seeed like they were all over the place. How does it drive now vs when the ms3 was in it??
I am going to bet absolutely perfect.
Can you explain why the 402 with the ms3 cam in place made such choppy power, and your new cam is smooth as silk ??
BTW great pickup of power everywhere, not just peak. Good cam selection.
I am going to bet absolutely perfect.
Can you explain why the 402 with the ms3 cam in place made such choppy power, and your new cam is smooth as silk ??
BTW great pickup of power everywhere, not just peak. Good cam selection.
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From: Western Burbs of Detroit
Afr 225's would open up the top end even more. I think I would stay with the 205's unless you had someone willing to pay a good price for them. Quality heads are getting more and more expensive.
Forgot to ask you, did you go to the track with the old cam and do you plan on going to the track with your new cam?? If so please post your best time slips from old and new setups. THANKS !!
Forgot to ask you, did you go to the track with the old cam and do you plan on going to the track with your new cam?? If so please post your best time slips from old and new setups. THANKS !!
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Verdad Gallardo With the old cam the car was a pain in the ***, it would surge quite a bit and was a pain to start up because it took awhile to find idol.
With the new cam in the car it runs 100% better. So far I have started up the car about 8 times without any problems at all with no surging. This is the first time since its been stock it has ran this good.
Along with the new cam, the great job my tuner did with retuning the car for speed density made all the difference.
With the new cam in the car it runs 100% better. So far I have started up the car about 8 times without any problems at all with no surging. This is the first time since its been stock it has ran this good.
Along with the new cam, the great job my tuner did with retuning the car for speed density made all the difference.
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From: Western Burbs of Detroit
By the looks of your new hp/tq curve it seems the power comes on smooth and evenly. Very smooth runner. Glad you are enjoying the new power and ease of driving.
Originally Posted by allngn_c5
Afr 225's would open up the top end even more. I think I would stay with the 205's unless you had someone willing to pay a good price for them. Quality heads are getting more and more expensive.
Forgot to ask you, did you go to the track with the old cam and do you plan on going to the track with your new cam?? If so please post your best time slips from old and new setups. THANKS !!
Forgot to ask you, did you go to the track with the old cam and do you plan on going to the track with your new cam?? If so please post your best time slips from old and new setups. THANKS !!
tfs 225 or a etp 225. Something I could mill to a 59 cc chamber.
With my old numbers I went to the track once and ran a 11.18 at 124 with a 1.75 60' time. I only got one full run in because I don't have a rollbar installed yet. I plan on hitting the track once within the next few weeks and hoping to have the rollbar in by the end of the summer so I should have a good end to the season.
Originally Posted by gman
I would love to step up to bigger heads, but like you said I would need to get a good price for my 205's. My head choices are pretty limited due to my compression and afr 225's would kill it. I would probally have to go with a
tfs 225 or a etp 225. Something I could mill to a 59 cc chamber.
With my old numbers I went to the track once and ran a 11.18 at 124 with a 1.75 60' time. I only got one full run in because I don't have a rollbar installed yet. I plan on hitting the track once within the next few weeks and hoping to have the rollbar in by the end of the summer so I should have a good end to the season.
tfs 225 or a etp 225. Something I could mill to a 59 cc chamber.
With my old numbers I went to the track once and ran a 11.18 at 124 with a 1.75 60' time. I only got one full run in because I don't have a rollbar installed yet. I plan on hitting the track once within the next few weeks and hoping to have the rollbar in by the end of the summer so I should have a good end to the season.
I think the car would ET the same (when compared to the 225 swap) but trap a little higher with the bigger head. The car would 60ft stronger with 205's and ET is all about the first sixty feet. BUT, you would lose some throttle response and low speed part throttle with the bigger head.
IMO I wouldn't touch the heads....there are VERY few A4 cars that have touched 500 RWHP....not easy for a six speed for that matter. Looks like a good running combo to me. If you really want to go faster at this point just spray it. Very few cylinders heads on the market that could help your situation (and it would be minimal gains), alot of them that could hurt it. Spending thousands to gain a few hundreths or a tenth is silly IMO. Consider using a little NOS....it wouldnt take much to knock your times down quite a bit and it works alot better on an A4 car than a six speed.
Either way great results and go give those 205's a little pat on their end pad the next time you pop the hood....LOL
Tony
Thanks for the info tony. After reading your post it doesn't seem to be to beneficial to swap out heads to go bigger. I have also talked to you in the past about opening up the 205's, but by doing that I would also lose some compression. It is hard to come by when running -14 cc pistons.
The throttle response has always been good with the 205's on the car and now with the sd tune it is even better. I have been wanting to throw a small shot of nos on it for some time now and that may just be my best bet.
The throttle response has always been good with the 205's on the car and now with the sd tune it is even better. I have been wanting to throw a small shot of nos on it for some time now and that may just be my best bet.
Sure listen to Tony when he tells you to keep the heads 
The Car did very well and I was happy.The best part was going SD and cleaning up the drivability on the dreaded 98 A4 car.
The old Cam was a bitch even when it was a 346.This Cam I spec'd for the setup to drive better and give more top end pull.It worked.As you see the A/F was pretty much the same and the timing was not changed up top.
The Car did very well and I was happy.The best part was going SD and cleaning up the drivability on the dreaded 98 A4 car.
The old Cam was a bitch even when it was a 346.This Cam I spec'd for the setup to drive better and give more top end pull.It worked.As you see the A/F was pretty much the same and the timing was not changed up top.
Last edited by Slowhawk; Jun 10, 2007 at 06:32 PM.
Originally Posted by gman
Thanks for the info tony. After reading your post it doesn't seem to be to beneficial to swap out heads to go bigger. I have also talked to you in the past about opening up the 205's, but by doing that I would also lose some compression. It is hard to come by when running -14 cc pistons.
The throttle response has always been good with the 205's on the car and now with the sd tune it is even better. I have been wanting to throw a small shot of nos on it for some time now and that may just be my best bet.
The throttle response has always been good with the 205's on the car and now with the sd tune it is even better. I have been wanting to throw a small shot of nos on it for some time now and that may just be my best bet.
Don....sometimes it takes a few people to dispense the same advice before it sinks in....LOL
Regards,
Tony
On The Tree
Joined: Jun 2007
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i have the AFR 225's on the stock block LS2, im making 505rwhp.441lbtq, im going to be doing a 402 also, i would thought with a 402 youd be more close to 520-550rwhp and 480-510lbtq, if i was going to keep my motor NA, do you think i should go with the 402?? or just leave it how it is. I was planning on spraying.
thanx
thanx
Originally Posted by choopak
i have the AFR 225's on the stock block LS2, im making 505rwhp.441lbtq, im going to be doing a 402 also, i would thought with a 402 youd be more close to 520-550rwhp and 480-510lbtq, if i was going to keep my motor NA, do you think i should go with the 402?? or just leave it how it is. I was planning on spraying.
thanx
thanx
