Need Help

[ktulu1984]

So I put my gauge mode on the multi view window that shows the boost in number form, not the gauge with the needle, and I noticed that I am running 17-18 PSI on full throttle. I was under the assumption that my car had factory pulleys and should only be pushing 15PSI. Is there a way to tell if the pulleys are factory? I got a PN from the belt, it is DR3V-8620-BA and also has 10PK2125. I did some dyno pulls from what I thought was stock, and then after installing some mods. My baseline was 617hp/598tq and after the mods in my sig, it was 715hp/675tq. I thought they were a little high, but a pulley might explain the numbers. Any advice would be great.

 

[Kenneth]

You buy the car used?

 

[STTOCK]

Take the belt off and mic the supercharger pulley. If it's less than 2.7, you have your answer.

 

[ktulu1984]

Yes I did, about a month ago with 18k miles.

 

[Kenneth]

Probably had a pulley swap done to it.
That's the boost I see with a 2.4 pulley on mine

 

[ktulu1984]

Looking with a measuring tape on the front of the pulley, it looks like 2 11/16 where the belt sits on the pulley, so that would be bout 2.7 if I could get a good measurement. It's definitely not smaller that 2 1/2, the bottom pulley looks factory, but it's hard to tell. It's got rust starting to show on it, and it's painted black from what I can see. Does anyone else see higher that 15 PSI with stock pulleys?

 

[David Neibert]

Looking with a measuring tape on the front of the pulley, it looks like 2 11/16 where the belt sits on the pulley, so that would be bout 2.7 if I could get a good measurement. It's definitely not smaller that 2 1/2, the bottom pulley looks factory, but it's hard to tell. It's got rust starting to show on it, and it's painted black from what I can see. Does anyone else see higher that 15 PSI with stock pulleys?

Might have a 10% crank pulley...If it says ATI or Innovators West on the crank pulley/balancer it's not stock.

David

 

[Snoopy49]

Could you run aftermarket pulleys with the stock belt and no aftermarket tensioner pulleys?

 

[carguy19]

You need to measure the surface of the pulley that the belt rides in to get the right size.

Sounds like the car has either a upper pulley or a lower on it. Can you see the lower pulley?

 

[Evil_E]

You need to measure the surface of the pulley that the belt rides in to get the right size.

Sounds like the car has either a upper pulley or a lower on it. Can you see the lower pulley?

x3. Now the first concern that comes to mind for me is if it does have a upper or lower pulley on it, how long has it been running with a stock tune on that setup? What kind of damage can be done running an upper or lower pulley without a tune.

 

[Snoopy49]

Can you run the stock belt with after market pulleys. The belt he listed is the stock belt.

 

[STTOCK]

Can you run the stock belt with after market pulleys. The belt he listed is the stock belt.

I believe all you need is a 90 millimeter idler to run the stock belt with an aftermarket pulley.

 

[Willie2]

Can you run the stock belt with after market pulleys. The belt he listed is the stock belt.

yes

I have a 2.4 upper and stock belt with no idler.

 

[ktulu1984]

Here is pics from what I can see.

 

[Kenneth]

x3. Now the first concern that comes to mind for me is if it does have a upper or lower pulley on it, how long has it been running with a stock tune on that setup? What kind of damage can be done running an upper or lower pulley without a tune.

He has a Lund tune already, so as long as it was datalogged he should be fine with the tune.

 

[Kenneth]

How about a pic of the upper pulley.

 

[Willie2]

doesn't the track pack make it very difficult to run a OD balancer?

 

[ktulu1984]

It's not letting me upload it for whatever reason, I'll try after while.

 

[ktulu1984]

Here is the top pulley.

 

[2011 gtcs]

The upper pulley does look a little smaller, it could be a 2.5 upper, the most accurate why to tell if you have a different upper is to remove the belt and mic the pulley.