possible to build boost without load on engine?
02-25-06, 04:35 PM
#1
tom port.. AKA streetport
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possible to build boost without load on engine?
with a stock s4 turbo(ported wategate) and tmic converted to fmic and 2 inch piping.......say i was at the drag strip and i wanted to build boost at the line...can it be done?? i have a manifold to turbo exhaust leak getting fixed real soon and i know im loosing boost so that is why i dont know...
02-25-06, 04:48 PM
#2
Fix the leak first.
It's possible - some people can do it, and I understand a ball bearing turbo makes it a lot easier to build boost in neutral, but most cars can't build a significant amount of boost in neutral.
Now, if you're hardcore, you could go with an antilag system. It retards the timing significantly, such that the exhaust port is open (or opening) as the spark fires. This makes very little power, but dumps burning fuel down the exhaust manifold, which will spool the turbo beautifully in neutral. However, it does *really* nasty things to the life of the turbo, and is more for rally cars & dedicated drag cars.
-=Russ=-
It's possible - some people can do it, and I understand a ball bearing turbo makes it a lot easier to build boost in neutral, but most cars can't build a significant amount of boost in neutral.
Now, if you're hardcore, you could go with an antilag system. It retards the timing significantly, such that the exhaust port is open (or opening) as the spark fires. This makes very little power, but dumps burning fuel down the exhaust manifold, which will spool the turbo beautifully in neutral. However, it does *really* nasty things to the life of the turbo, and is more for rally cars & dedicated drag cars.
-=Russ=-
02-25-06, 05:10 PM
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tom port.. AKA streetport
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gasket is in hand...just waiting on better weather 
ill stay away from the antilag system...lol its a DD and wanted to know if it could be done..
ill stay away from the antilag system...lol its a DD and wanted to know if it could be done..
02-25-06, 05:15 PM
#4
Super Raterhater
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Short answer? No. You can build boost in neutral by hitting WOT and letting it rev, but it'll only be there shortly as it revs and then drop off, and you can't build it by holding any specific rpm. You can get a two-stage setup that sets a rev limiter at a lower RPM than normal, and this backfiring/etc through your exhaust will get the turbo spooled up a lot more than you could manage holding it at the specific rpm, but this wreaks havoc on your turbo (Ask Jrat!)
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02-26-06, 02:20 PM
#11
Or you could get an auto and preload the torque converter, which puts a load on the engine. Not really worth it on a DD, though.
Edit, just looked at the flat shift thing. Isn't that the same principal behind two-staging?
Edit, just looked at the flat shift thing. Isn't that the same principal behind two-staging?
Last edited by Sideways7; 02-26-06 at 02:23 PM.
02-27-06, 11:32 PM
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holley guy
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Getting a two step setup on a rotary is a little more dificult than on a piston engine because of the two separate ignition systems (leading and trailing). If you have a standalone then it becomes much easier, as it controls both leading and trailing.
02-28-06, 06:34 AM
#17
Lives on the Forum
Why would you WANT to do this?
The bitch is hard enough as it is to get the damn thing to hook-up from a standing start.
Are you using racing slicks?
If not, you don't need it, and making MORE power out of the hole is probably going to smoke the tires.
Back when I was doing this seriously, I was launching at 5,000RPM on 225 / 50 / 16 Nitto NT-555R drag radials.
The car was only making 250 at the wheels.
-Ted
The bitch is hard enough as it is to get the damn thing to hook-up from a standing start.
Are you using racing slicks?
If not, you don't need it, and making MORE power out of the hole is probably going to smoke the tires.
Back when I was doing this seriously, I was launching at 5,000RPM on 225 / 50 / 16 Nitto NT-555R drag radials.
The car was only making 250 at the wheels.
-Ted
02-28-06, 02:39 PM
#19
tom port.. AKA streetport
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Originally Posted by RETed
Why would you WANT to do this?
The bitch is hard enough as it is to get the damn thing to hook-up from a standing start.
Are you using racing slicks?
If not, you don't need it, and making MORE power out of the hole is probably going to smoke the tires.
Back when I was doing this seriously, I was launching at 5,000RPM on 225 / 50 / 16 Nitto NT-555R drag radials.
The car was only making 250 at the wheels.
-Ted
The bitch is hard enough as it is to get the damn thing to hook-up from a standing start.
Are you using racing slicks?
If not, you don't need it, and making MORE power out of the hole is probably going to smoke the tires.
Back when I was doing this seriously, I was launching at 5,000RPM on 225 / 50 / 16 Nitto NT-555R drag radials.
The car was only making 250 at the wheels.
-Ted
03-01-06, 05:26 AM
#20
Lives on the Forum
With the nasty camber in the rear, I managed a 2.1xx.
When it did that, I was surprised it got out of the hole that quick.
This is with the stock Turbo II LSD back there.
-Ted
When it did that, I was surprised it got out of the hole that quick.
This is with the stock Turbo II LSD back there.
-Ted
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