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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-25-2011, 04:25 PM   #21
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but even on the dynojet... it was over 240 right?
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Old 02-26-2011, 04:48 PM   #22
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BTW How do you close the hood?

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Old 02-27-2011, 12:11 AM   #23
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What hood?
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Old 02-27-2011, 01:02 AM   #24
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Quote:
Originally Posted by eyesoreracing View Post
What hood?
Doesn't that make the radiator and any heat exchanger extremely inefficient?
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Old 02-27-2011, 01:20 AM   #25
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Nope. The hoodless cars tend to cool better than the hooded ones. If there is any degredation in airflow across the radiator (and I'm not convinced there is), the airflow around the engine makes up for it.

Besides, our radiator is in the passenger's seat.

-Dave
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Old 02-27-2011, 01:01 PM   #26
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Quote:
Originally Posted by eyesoreracing View Post
What hood?
the roof?
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Old 02-28-2011, 08:21 AM   #27
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Quote:
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This time was no different. We went straight to our load test, which consists of pulling 5th gear to redline, pulling the engine down to 4000 rpm with the dyno brake, and then pulling back to redline again.
Holly ****, I'm not the only one who does this!!! I've used 4 different dynos, only one guy understands why. I think if more people did this, we'd see much more conservative spark tables, maybe even more low-compression pistons going in engines.
More on this please.

Do you bring it down slowly or quickly? Hold it at 4k for a little? Let it go back to redline without restriction?
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Old 02-28-2011, 11:54 AM   #28
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I'm trying to duplicate track conditions when I do it, so I operate as if I'm shifting. Redline - clutch - dyno brake to 4000ish - release dyno brake - release clutch - pull back to redline. I try to do the whole thing as quickly as possible, but the dyno won't pull down as fast as you can shift.

Make sure the car is tied down really well when you do this, as the loads shift more during that simulated shift than they do during a normal pull.

Also, make sure the dyno has a really serious fan, or else you're not simulating anything real at all. MD Automotive has 2 hp, 4' diameter monster that blows 60 mph. This is what a dyno needs.

-Dave
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Old 02-28-2011, 12:21 PM   #29
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I did it similar to Jkav but 3500-6000rpm 4-5-6 and I use some load on the pulls too. I do this every lap at TWS, why not do it on the dyno (without the 150mph wind)?
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Old 02-28-2011, 02:42 PM   #30
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Never did dyno it, but FWIW I did that 1/4th in my sig at 6 psi on a stock '99 engine.
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