Hay 10 second Maggie guys what boost/pulley?

[maxdmax]

Apparently all cars are not the same as far as boost and pulley size for the faster cars. I assume it is due to the level of supporting mods like CAMs, fuel systems and other mods. After quite a bit of reading it does seem that my car is really really low on the boost verses pulley size with 9 psi on a 3.2 pulley. Pretty sure there is no belt slipping. We added a ZR1 3bar map sensor to be sure there was not something going on with the gauge. I am thinking about going down to a 3.10 pulley, below are my mods around this. Any ideas also what are you seeing on your cars as far as boost/pulley size?

Stock block LS3 stick car
TVS 2300 SC
No Meth 93 pump gas
G5XB CAM
LPE Electronic duel fuel pump
Fast 65lb injectors
Kooks 1 7/8 Headers (No cats - Magnaflow 3" exhaust)
Halltech CAI
Jannetty belt tensioner
TVS 2300 Cog-drive
HP 638 601 TQ

[Supercharged SS]

With the overdriven cog drive in the rear, an Innovators West overdriven 8 rib set-up in the front, and a 3.2 pulley I make 17/18 psi. The problem is that during each shift I have belt slip so the boost drops down to 12 psi and subsequently I am loosing major HP.

I'd be worried about belt slip when you get down to a 3.1 pulley. At 10 psi we found that the rear pulley's were slipping.

I'd putting my IW 8 rib set-up in the classifieds right now and looking to get into a 10 rib. It was awesome for up to 14ish psi but I got the jones for more boost!!!!!!!!!!!!

My car made 684/690 at 5500. That's when the boost falls off.

[JLE58]

You got some belt slip I'd almost bet money on it with a 3.2. You also have a good cam and headers which is going to bring the boost down which isn't a bad thing cause your still getting the power of the pulley with less pressure. Think of boost as resistance in a way.

[maxdmax]

Originally Posted by Supercharged SS

With the overdriven cog drive in the rear, an Innovators West overdriven 8 rib set-up in the front, and a 3.2 pulley I make 17/18 psi. The problem is that during each shift I have belt slip so the boost drops down to 12 psi and subsequently I am loosing major HP.

I'd be worried about belt slip when you get down to a 3.1 pulley. At 10 psi we found that the rear pulley's were slipping.

I'd putting my IW 8 rib set-up in the classifieds right now and looking to get into a 10 rib. It was awesome for up to 14ish psi but I got the jones for more boost!!!!!!!!!!!!

My car made 684/690 at 5500. That's when the boost falls off.

I had the rear pulley start to slip when I went to the 3.2 pulley so I got the Jannetty tensioner and the rear 1:1 cog drive. I am pretty sure I am OK since I have no belt dust anywhere now and the boost went up proportionally as expected all along from a 3.6 at 5.5 psi and then a 3.4 at 7.3 psi and finally a 3.2 at 9 psi. I'm with you I could very well get back to some slipping at 3.1 but than again I am not spinning it even close to your setup. If I do the short block I want from ERL this winter I will probably need to go to the 10 rib. Thoughts?

[Supercharged SS]

Originally Posted by JLE58

You got some belt slip I'd almost bet money on it with a 3.2. You also have a good cam and headers which is going to bring the boost down which isn't a bad thing cause your still getting the power of the pulley with less pressure. Think of boost as resistance in a way.

I'd have to agree about the belt slip. 9 psi with a 3.2 is on the low side even with a cam and headers. I was at 12.5 psi with a 3.2, LS3 conversion and 2" headers. That was with the 8 rib. It wasn't worth trying with the 6.

[Supercharged SS]

Originally Posted by maxdmax

I had the rear pulley start to slip when I went to the 3.2 pulley so I got the Jannetty tensioner and the rear 1:1 cog drive. I am pretty sure I am OK since I have no belt dust anywhere now and the boost went up proportionally as expected all along from a 3.6 at 5.5 psi and then a 3.4 at 7.3 psi and finally a 3.2 at 9 psi. I'm with you I could very well get back to some slipping at 3.1 but than again I am not spinning it even close to your setup. If I do the short block I want from ERL this winter I will probably need to go to the 10 rib. Thoughts?

I had no dust as well. The dyno told the tale of the belt slip. We just saw it again last week.

[JLE58]

Yeah but he is on a 6 rib I thought and didn't know he had teds tensioner or the cox I figured he was using stock Maggie set up

[kevin1106]

From what I've been told, your in a safe zone right now. Any more boost and your gonna risk damaging your motor. I'd do all forged internals before adding anymore boost. IMO

[JLE58]

Cog... Not cox lol sorry typing from I phone. Sorry Jamie I thought you said you disagree not Agree in a DA

[Supercharged SS]

Originally Posted by JLE58

Yeah but he is on a 6 rib I thought and didn't know he had teds tensioner or the cox I figured he was using stock Maggie set up

The cog drive def eliminated the any rear slipping. The JRE super tensioner I'm sure has helped a ton but it all comes down to belt wrap vs how fast you are spinning the blower. He may have just enough slippage to lose a few psi in the higher rpm range.

[JLE58]

I'd agree if it was me anything under a 3.4 I'd go 8 rib

[maxdmax]

Originally Posted by Supercharged SS

I had no dust as well. The dyno told the tale of the belt slip. We just saw it again last week.

What did you see on the dyno when the belt slipped? When my 3.2 slipped the boost was abput 1 to 1.5 psi higher until 3000 RPM and then just crossed below the line of the 3.4 and stayed about 1 or so pounds lower up to redline. It was odd, but we did not see a sharp drop anywhere. We knew it had to be slippage due to the numbers however. I will email my tuner and see if I can get my dyno charts and post them.

[Supercharged SS]

Originally Posted by maxdmax

What did you see on the dyno when the belt slipped? When my 3.2 slipped the boost was abput 1 to 1.5 psi higher until 3000 RPM and then just crossed below the line of the 3.4 and stayed about 1 or so pounds lower up to redline. It was odd, but we did not see a sharp drop anywhere. We knew it had to be slippage due to the numbers however. I will email my tuner and see if I can get my dyno charts and post them.

Maybe Ted will see this or you can just email him for my dyno graph. I don't have it here. From what he described the lines, rwhp,tq, and boost climb in an uppward linear fashion then when you get to 5500 the drop off instantly and the boost drops down to 12 psi and then the other numbers decrease as well.

[maxdmax]

Originally Posted by Supercharged SS

Maybe Ted will see this or you can just email him for my dyno graph. I don't have it here. From what he described the lines, rwhp,tq, and boost climb in an uppward linear fashion then when you get to 5500 the drop off instantly and the boost drops down to 12 psi and then the other numbers decrease as well.

I can see that for sure, the deal on my car is it was smooth as any normal dyno run just less after 3000 rpms when it slipped. After the tensioner and the cog it went right to 9 psi and at the end close to 9.5 psi for the last bit. We were in a hurry so I am not sure we really looked at it closely. I emailed my tuner to send me the last 3 dyno graphs if he could all on the same graph so we could see the 3.4 at 7 psi, 3.2 slipping and the 3.2 after the mods.

Thanks for the help and comments!