Nic Posted May 28, 2007 Share Posted May 28, 2007 I would never want a big, slow spooling old school Japanese turbo with 650bhp, it'd be completely unusable for me as a daily driver, and far slower on the street than a 450rwhp T61 or T67. Quote Link to comment Share on other sites More sharing options...
stupra Posted May 28, 2007 Share Posted May 28, 2007 I've gone for a BL t61 as I want good usable power, i'd rather have around 400 - 450 rear wheel bhp than something with 700 rear wheel bhp and struggle getting the power down, there's no point in having it if you cant use it. From what i've seen a good t61, t67 (or something similar), will be on boost and gone before a big turbo like a t88 gets going. A t88 would be pointless around my way. Quote Link to comment Share on other sites More sharing options...
TLicense Posted May 28, 2007 Share Posted May 28, 2007 its going a bit off topic here but the thread is why do most single turbos read less bhp comapared to ones from japan. is it due to turbo choice badly built singles bad mapping Budgets etc etc etc am just curious to know, but it looks like the turbo choice and budget been the main issue Yes, yes, probably yes, and probably yes. I should imagine the Jap ones have poor turbo choice, are badly built without enough thought to longevity and drivability, are probably mapped to run as lean as humanly possible and it's most likely all down to the lack of budget. Quote Link to comment Share on other sites More sharing options...
Guest Nicholas Posted May 28, 2007 Share Posted May 28, 2007 I think the lack of power is down to the stock cams? I have a stock engine and my single makes 537BHP @ Fly as Dan Turner say's the stock cams are very restrictive when it comes to raw HP. Quote Link to comment Share on other sites More sharing options...
Homer Posted May 28, 2007 Share Posted May 28, 2007 I think the lack of power is down to the stock cams? I have a stock engine and my single makes 537BHP @ Fly as Dan Turner say's the stock cams are very restrictive when it comes to raw HP. Cams cannot make up thousands of rpm of loss in spool time. They make a difference yes, but it's more fine tuning than marked differences to the turbo spool time. See the data logs Ian C posted last year for exact details on the difference. I think it got an extra 50bhp or so at peak. Quote Link to comment Share on other sites More sharing options...
Guest Nicholas Posted May 28, 2007 Share Posted May 28, 2007 Cams cannot make up thousands of rpm of loss in spool time. They make a difference yes, but it's more fine tuning than marked differences to the turbo spool time. See the data logs Ian C posted last year for exact details on the difference. I think it got an extra 50bhp or so at peak. Ahh I see, will take a look at Ian C's posting. Quote Link to comment Share on other sites More sharing options...
Rich Posted May 28, 2007 Share Posted May 28, 2007 I always thought changing from stock cams to say 256/264/272 cams increased the lag a little.But offers more power higher up the rev range. Quote Link to comment Share on other sites More sharing options...
Homer Posted May 28, 2007 Share Posted May 28, 2007 I always thought changing from stock cams to say 256/264/272 cams increased the lag a little.But offers more power higher up the rev range. I think Ian found a 264/264 setup raised both the mid range and high range torque (obviously with map changes). His test on the 272/264 setup showed a massive decrease in mid range torque and spool time. Quote Link to comment Share on other sites More sharing options...
jagman Posted May 29, 2007 Share Posted May 29, 2007 to compare turbo to turbo ,or car to car by using BHP is pointless the maximum bhp is only a function of RPM AND TORQUE it does not indicate how fast a car is could a 350 bhp car be faster than a 400 bhp car -YES for example if the 350 was a diesel 1.4 turbo race cars were making way over 1000 bhp -how? they were revving to 18000 rpm!!!! but you wouldnt want to drive one to the shops or in a traffic jam! we should ban bhp and make everyone use torque and redline ie my car makes xxx torque and redlines at yyyy rpm a bit off topic but who is running the highest torque on the forum? Quote Link to comment Share on other sites More sharing options...
TLicense Posted May 29, 2007 Share Posted May 29, 2007 Strictly speaking even that doesn't give a true indication of how quick a car is. It's all about area under the torque curve. You could have a really peaky 500lbft at 6500rpm that readlines at 9000rpm that would be slower than a car that has a flat torque curve that reaches 400lbft at 4500rpm and redlines at 7000rpm. I'll stop being pedantic now. Quote Link to comment Share on other sites More sharing options...
Krister Posted May 29, 2007 Share Posted May 29, 2007 Cams cannot make up thousands of rpm of loss in spool time. They make a difference yes, but it's more fine tuning than marked differences to the turbo spool time. See the data logs Ian C posted last year for exact details on the difference. I think it got an extra 50bhp or so at peak. Usually cams will aid in spool up because it makes the head flow better. More flow = better spool. There was a dynosheet posted on supraforums that was taken before and after HKS 264 cams and it made better power across the power band. This was with a T61 or T67 turbo. Quote Link to comment Share on other sites More sharing options...
Wez Posted May 29, 2007 Share Posted May 29, 2007 Torque is your friend and makes the car fast Quote Link to comment Share on other sites More sharing options...
Wez Posted May 29, 2007 Share Posted May 29, 2007 Usually cams will aid in spool up because it makes the head flow better. More flow = better spool. There was a dynosheet posted on supraforums that was taken before and after HKS 264 cams and it made better power across the power band. This was with a T61 or T67 turbo. I agree, the 264/264 setup offered increase in spool after the map was modified, I am still waiting for my 264 inlet cam Quote Link to comment Share on other sites More sharing options...
mr keef Posted May 29, 2007 Share Posted May 29, 2007 i love this single talk:d Quote Link to comment Share on other sites More sharing options...
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