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Listen to my hands...
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Discussion Starter #1
Does anyone have dyno sheets of a singled or big twin car, before and after camshafts? I always hear they give you about 200-400 rpms worth of lag. I would actually like to see a comparison.

I know most people do cams when they upgrade...so I might be reaching with this request.

Thanks.

Scott

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I am too want to see this. I have the 264 cams I am getting ready to put in then dyno. It would probably take a couple of months before I get to it though. Any have the comparision?
 

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That is a nice setup you have there Scott. Nice clean engine by too. I was just curious......when do those twins come online. Is the lag really as bad as everyone says?
 

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Listen to my hands...
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Discussion Starter #5 (Edited)
boostedsupratt said:
That is a nice setup you have there Scott. Nice clean engine by too. I was just curious......when do those twins come online. Is the lag really as bad as everyone says?
Thanks for the compliments:) That pic was taken before I ever had a chance to drive the new setup. That's why it's so clean. It was pushed outside for an Ohio Supra meet(May 2000).

I have had tuning issues for almost 2 years. Finally have them sorted. The boost comes on at around 4300 rpms. If you want big power you need a big turbo(s). Plus I have a raised rev limit, so staying in the power band is very easy. There are some smaller turbos that are more practical now. The Twins cost too much to recommend. I bought my kit for $5500...3 days before the first HKS price increase.

I didn't build a drag car...or a car to please other people(dumbestic owners:) who make jokes about 700hp Supras.
My car is fast where I drive it 99% of the time...The streets/highway.


Scott

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SCOTT. I have before and after dyno sheets of your same set up 264 cams HKS twins. except i have alot of extrude hone done. but i can tell you 264 cams did not gave me any more lag I think its because of the extrude hone. I like your last post about not building your car for anyone but your self. it seems people who cant afford the big twnis do nothing but bad mouth them. i dont nkow if i can post the dyno sheets but if you like e mail privately i'll fax them to you..
 

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2835rls said:
SCOTT. I have before and after dyno sheets of your same set up 264 cams HKS twins. except i have alot of extrude hone done. but i can tell you 264 cams did not gave me any more lag I think its because of the extrude hone. I like your last post about not building your car for anyone but your self. it seems people who cant afford the big twnis do nothing but bad mouth them. i dont nkow if i can post the dyno sheets but if you like e mail privately i'll fax them to you..
I'd also be interested in such information.
 

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Listen to my hands...
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Discussion Starter #8
2835rls said:
SCOTT. I have before and after dyno sheets of your same set up 264 cams HKS twins. except i have alot of extrude hone done. but i can tell you 264 cams did not gave me any more lag I think its because of the extrude hone. I like your last post about not building your car for anyone but your self. it seems people who cant afford the big twnis do nothing but bad mouth them. i dont nkow if i can post the dyno sheets but if you like e mail privately i'll fax them to you..
I don't have a fax...could you attach an e-mail with the sheet? I could get a # from a friend. Thanks for the offer. I'm actually ordering some on Monday.

Do you have the intake and heads honed? I was wondering what the all around benefits were...or any trade offs?

What have you put down so far?


Scott

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scott i put down so far 820 rwhp at 32 psi. before the cams and extrude hone 775 at 33 psi. yes the head and intakes top and bottom are done.we left the intake and exhaust cam gears dialed in at 0. we nkow we can get more out of this combination beacuse we tuned it rich as hell to be safe.
 
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Hmmm, interesting stuff. I have been considering the next path to take, and it's good to see you have had good experience with extrudehoning.

I believe the lag with cams is less than formerly believed. I think I lost 200-300 rpms with my 272 cams. No so bad, considering.

I just recently put on .87 A/Rs, and picked up 15 rwhp. (whoopty do) Didn't notice any seat of the pants difference. Scott, what size injectors are you using now?
 

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Listen to my hands...
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Discussion Starter #11
Walser said:
Hmmm, interesting stuff. I have been considering the next path to take, and it's good to see you have had good experience with extrudehoning.

I believe the lag with cams is less than formerly believed. I think I lost 200-300 rpms with my 272 cams. No so bad, considering.

I just recently put on .87 A/Rs, and picked up 15 rwhp. (whoopty do) Didn't notice any seat of the pants difference. Scott, what size injectors are you using now?
I'm running 680/720s(Dave M. as well) That's what Guilly is running. I don't know his A/Fs or duty cycles though. What they are capable of is still up in the air.

What's it cost for a set of retainer springs? I was going to bump my rev limit to 8k and was wondering if I need them?

I'm getting the cams. Seeing Dave's car spool up only 200rpms slower(until 5200) than my setup convinced me:)

You're going to the Texas meet right?

Scott

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I am still planning on going to the Texas meet. It's only a few hours drive for me.

I think springs and retainers cost about $400 from TurboImports.com, which is where I got mine. They are Crower brand. My stock springs lasted about 6 months at 7800 rpms until an exhaust spring got worn out and wouldn't completely seal anymore. I pulled off the head, had it rebuilt with the springs and retainers, and it has lasted about a year now without a problem.
 

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Scott, springs/retainers are a safety issue. They allow you to rev higher without worrying so much. Now, as for dave and guilly's injectors, that explains why they made so much HP. I would bet ALOT of $ that they went way lean. My 720 cc injectors maxed out (at 42 psi static) at around 690 rwhp. I bet their a/f is around 13-13.5:1.
Peter
 

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Discussion Starter #14
houstonT said:
Scott, springs/retainers are a safety issue. They allow you to rev higher without worrying so much. Now, as for dave and guilly's injectors, that explains why they made so much HP. I would bet ALOT of $ that they went way lean. My 720 cc injectors maxed out (at 42 psi static) at around 690 rwhp. I bet their a/f is around 13-13.5:1.
Peter
Is it hard to get the 850s to idle smooth? I might need to that when I have the cams and springs put in.


Scott

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