Cam timing with turbo engine
06-27-2006, 01:25 PM
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Cam timing with turbo engine
Need to now what adjustments to make to my cam sporckets in order to shift my power band higher in the rpm range.
Setup: H22a sleeved block w/rods & pistons
T3/t4 Garret turbo
Vatious electronics(elec.bst contrler,additional injectors,etc
I been boosting 13psi daily for the past few years, ocasionally up to 20 psi
The car pulls hardest up to mabe 6500rpm but then th power falls off a bit up to 8000. My head came originally from a auto lude and has no mods. I assume because the cams are from an auto lude, are designed to make peak power at lower rpm than the manual cams.
Can I use my adj sprockets to shift the power band up a bit? If so can some one who has done this before give me an idea what adjustment to make to each cam.
Thanks
Setup: H22a sleeved block w/rods & pistons
T3/t4 Garret turbo
Vatious electronics(elec.bst contrler,additional injectors,etc
I been boosting 13psi daily for the past few years, ocasionally up to 20 psi
The car pulls hardest up to mabe 6500rpm but then th power falls off a bit up to 8000. My head came originally from a auto lude and has no mods. I assume because the cams are from an auto lude, are designed to make peak power at lower rpm than the manual cams.
Can I use my adj sprockets to shift the power band up a bit? If so can some one who has done this before give me an idea what adjustment to make to each cam.
Thanks
06-27-2006, 06:51 PM
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Re: Cam timing with turbo engine (bradboy)
Are you going to "butt dyno" this to decide if you are making more power????
Generally you advance the Intake and retard the Exhaust, or it is completely the other way around, i forget exactly..... good luck to your motor
Generally you advance the Intake and retard the Exhaust, or it is completely the other way around, i forget exactly..... good luck to your motor
06-27-2006, 07:56 PM
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Re: Cam timing with turbo engine (96 GSR-T)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T »</TD></TR><TR><TD CLASS="quote">Generally you advance the Intake and retard the Exhaust, or it is completely the other way around, i forget exactly..... good luck to your motor </TD></TR></TABLE>
That's going to increase the overlap, which usally isn't the thing you want to do with a boosted car. The dyno is the only way to see how it affects it for sure.
</TD></TR></TABLE>That's going to increase the overlap, which usally isn't the thing you want to do with a boosted car. The dyno is the only way to see how it affects it for sure.
06-27-2006, 08:09 PM
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Re: Cam timing with turbo engine (Naterror)
I was just going by what an unnamed tuner said he does with Honda Cams, not aftermarkets. I just figured I would give him somewhere to start since I am assuming he is using the butt method, I did the advance/retard on my old setup and I "felt" a noticeable difference but was not verified on a dyno
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07-01-2006, 07:20 AM
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Re: (bradboy)
You can't band-aid junk cams by twisting cam gears.
My experience with cam gears is you generally get as much power turning boost up 1 psi as you do spending an hour on the dyno to determine the "perfect" setting. Unless you are dealing with a racecar that has plenty of traction and needs ever 1/10th of a horsepower to get an edge, fiddling cam gears is gay.
If your compressor was larger then your camshafts power band gets pushed upward in the rev range as the boost pressure increases. I doubt you'll experience this much or at all with a T04E on a (comparatively) large displacement H22. T67 on a B-series = perfection.... B16 cams and 2.0 bottom end still making power at 9000 rpms.
Overlap is a good thing in a turbo cam... if your car is set up correctly, once the wastegate opens it is not uncommon for intake pressure to be greater than exhaust pressure, in which case the engine behaves more like a NA one.
My experience with cam gears is you generally get as much power turning boost up 1 psi as you do spending an hour on the dyno to determine the "perfect" setting. Unless you are dealing with a racecar that has plenty of traction and needs ever 1/10th of a horsepower to get an edge, fiddling cam gears is gay.
If your compressor was larger then your camshafts power band gets pushed upward in the rev range as the boost pressure increases. I doubt you'll experience this much or at all with a T04E on a (comparatively) large displacement H22. T67 on a B-series = perfection.... B16 cams and 2.0 bottom end still making power at 9000 rpms.
Overlap is a good thing in a turbo cam... if your car is set up correctly, once the wastegate opens it is not uncommon for intake pressure to be greater than exhaust pressure, in which case the engine behaves more like a NA one.
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