What mods can I do to decrease turbo lag?
Junior Member
Joined: Feb 2001
Posts: 1,618
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Pre-turbo NOS is not a good idea.
When shooting nitrous, you actually want to be in the higher RPM range of the engine. You can probably some way make it possible to juice earlier in the RPM range, but it is very easy to blow your motor while juicing at too low of an RPM.
As an example, on a Camaro (LT1 or LS1), the bare minimum safe RPM to hit the juice is 2500rpm, 3000rpm is a lot safer. On an S4, I'm going to shoot for 4000rpm and shut down at 6700rpm. I can't tell you on a 1.8T though, I know very little about them right now. Still learning!
As an example, on a Camaro (LT1 or LS1), the bare minimum safe RPM to hit the juice is 2500rpm, 3000rpm is a lot safer. On an S4, I'm going to shoot for 4000rpm and shut down at 6700rpm. I can't tell you on a 1.8T though, I know very little about them right now. Still learning!
AudiWorld Super User
Joined: Nov 2000
Posts: 6,270
Likes: 0
How much do you want to spend/do?
There are several ways to increase spoolup in general:
1. Decrease intake restrictions before turbo
Cone filter, smooth hoses, etc.
2. Decrease intake restrictions after turbo
IC with less pressure drop, smoother flowing tubes
3. Decrease exhaust restrictions before turbo
Port/polish exhaust ports, turbo header
4. Decrease exhaust restrictions after turbo
High-flow cat, good exhaust
5. Get a more efficient turbo
ball bearing turbo
6. Revise the wastegate controller
Get rid of bleed-type setups, switch to on/off type setup.
7. Upgrade bypass valve (no leaks, close sooner)
1. Decrease intake restrictions before turbo
Cone filter, smooth hoses, etc.
2. Decrease intake restrictions after turbo
IC with less pressure drop, smoother flowing tubes
3. Decrease exhaust restrictions before turbo
Port/polish exhaust ports, turbo header
4. Decrease exhaust restrictions after turbo
High-flow cat, good exhaust
5. Get a more efficient turbo
ball bearing turbo
6. Revise the wastegate controller
Get rid of bleed-type setups, switch to on/off type setup.
7. Upgrade bypass valve (no leaks, close sooner)
AudiWorld Super User
Joined: Mar 2001
Posts: 8,207
Likes: 0
Replace the Waspalloy rotor with a Silicon Nitride rotor...
About one fourth the density on SiN, giving you a lot less inertial mass to overcome. Only problem is the extreme difficulty of forming SiN. Once you get around that the difference in performance would definitely be noticeable...
Now cost on the other hand... well if you could do this economically you'd be a millionaire...
Don't you just love estoreric material's knowledge?
Now cost on the other hand... well if you could do this economically you'd be a millionaire...
Don't you just love estoreric material's knowledge?
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