New record for pump gas, set with the HTA35r
Nov 13, 2007, 12:40 PM
#32
I think its a combination of a larger turbo and a good balance of timing. A stockish turbo on that much boost would be blowing hot air and out of efficiency but a 35r is in a sweet spot.
Just my guess...
Can't wait to see them c16 numbers Dave! Man next time I visit family up north in PA I will have to make a side trip to your shop
Just my guess...
Can't wait to see them c16 numbers Dave! Man next time I visit family up north in PA I will have to make a side trip to your shop
Nov 13, 2007, 12:44 PM
#34
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OK, all finished. Final boost was 38-39 psi. Car is still "conservative" running low 11:1 AFR's and timing that isn't aggressive by any means. I am surprised at the power the car made. You always want them to come out this good by not pushing them but it doesn't always happen.
This car is equipped with all the factory weight too along with A/C and such.
Final numbers 615 whp/509 ft lbs. Here is the dyno sheet:
I still have to road tune the car Marque and make sure it drives good for you. I should be able to get to that tomorrow, I don't have anyone spare today to drive it while I watch the laptop.
This car is going to blow you mind.
This car is equipped with all the factory weight too along with A/C and such.
Final numbers 615 whp/509 ft lbs. Here is the dyno sheet:
I still have to road tune the car Marque and make sure it drives good for you. I should be able to get to that tomorrow, I don't have anyone spare today to drive it while I watch the laptop.
This car is going to blow you mind.
Nov 13, 2007, 12:47 PM
#35
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quick question Dave, what do u do with the PCV valve on such high HP cars? do u vent both to atmosphere?
im almost positive u vent the valve cover one, but what about the crank cover one?
im almost positive u vent the valve cover one, but what about the crank cover one?
Nov 13, 2007, 01:21 PM
#41
It was discussed here sometime ago that the UK tuners were running considerably more boost pressures than their U.S. counterparts, despite using a similar fuel to our 93 octane. When it was asked how U.S. tuners concluded that 22-23 psi was the max possible for 93 octane fuel, no one had a clear answer.
As the boost pressure is turned up, the ignition advance has to be reduced. At some point, turning up the boost pressure further won't yield any additional power, simply because the ignition retard will be too much. As to where this point typically occurs, it's never been made clear. . . but it appears to be significantly higher than what most of us expected, as you can plainly see in this discussion.
And I might add that turbo efficiency definitely is a factor here that cannot be ignored.
Last edited by Ted B; Nov 13, 2007 at 01:25 PM.
Nov 13, 2007, 01:30 PM
#42
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Thanks for the explanation. Craziness.
Edit: As far as turbo efficiency goes, David said before that he runs 32 psi on the stock turbo?
Edit: As far as turbo efficiency goes, David said before that he runs 32 psi on the stock turbo?
Last edited by Adam@MMS; Nov 13, 2007 at 01:33 PM.
Nov 13, 2007, 01:34 PM
#44
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It was discussed here sometime ago that the UK tuners were running considerably more boost pressures than their U.S. counterparts, despite using a similar fuel to our 93 octane. When it was asked how U.S. tuners concluded that 22-23 psi was the max possible for 93 octane fuel, no one had a clear answer.
As the boost pressure is turned up, the ignition advance has to be reduced. At some point, turning up the boost pressure further won't yield any additional power, simply because the ignition retard will be too much. As to where this point typically occurs, it's never been made clear. . . but it appears to be significantly higher than what most of us expected, as you can plainly see in this discussion.
And I might add that turbo efficiency definitely is a factor here that cannot be ignored.
As the boost pressure is turned up, the ignition advance has to be reduced. At some point, turning up the boost pressure further won't yield any additional power, simply because the ignition retard will be too much. As to where this point typically occurs, it's never been made clear. . . but it appears to be significantly higher than what most of us expected, as you can plainly see in this discussion.
And I might add that turbo efficiency definitely is a factor here that cannot be ignored.
I have been doing more tuning on 93 and have found that despite my old tune being at 21-22 psi I am can easily run 25psi with very little to no knock.
