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I have no idea where it is, but I will have a look when I have a chance. Hacker knows some stuff for sure, and I am sure he has valid points. However, I have not heard that there are big piles of L-jet cars that blew up because of Carl's kits. As opposed to his 32 valve stroker builds. Many of those were NFG and you heard about it here.
He started with the Powerdyne BD-11a Supercharger. They were cheap, not very reliable due to the internal belt drive and not all that efficient either.
Good info on them here: https://www.jonbondperformance.com/p...s-precautions/
On top of all that, the intercooler he did offer was grossly inadequate.
Great information on that Jon Bond page.
"Bypass /blow off valve is not required unless over 9psi, however, we recommend one for longer belt life."
I moved the BOV on my 928 MS 32V Raptor kit (3~4 psi boost) close to the throttle body versus next to the supercharger as an experiment. Moving the BOV vastly improved throttle response. Plus, before this change, each time the automatic shifted there was an unpleasant lag after the BOV dumped boost. Now shifts are crisp.
(The Australian made Raptor is internally belt driven. I sent mine back for a rebuild and it was upgraded to a 30mm wide belt and billet impeller.)
"Bypass /blow off valve is not required unless over 9psi, however, we recommend one for longer belt life."
I moved the BOV on my 928 MS 32V Raptor kit (3~4 psi boost) close to the throttle body versus next to the supercharger as an experiment. Moving the BOV vastly improved throttle response. Plus, before this change, each time the automatic shifted there was an unpleasant lag after the BOV dumped boost. Now shifts are crisp.
(The Australian made Raptor is internally belt driven. I sent mine back for a rebuild and it was upgraded to a 30mm wide belt and billet impeller.)
AMAZING!!!! What kit did you use or did you just piece out yourself?
I have no idea where it is, but I will have a look when I have a chance. Hacker knows some stuff for sure, and I am sure he has valid points. However, I have not heard that there are big piles of L-jet cars that blew up because of Carl's kits.
Valid point, but you also don't really see a slew of people claiming their L-Jet (or CIS) 928 worked well with the kit either. I can recall a couple folks I talked to with said kit only making 2-3psi at the very top end of the RPM range. Some others their car ran so bad they simply stopped driving it or took the kit off.
The "tuning" method was "run super rich to keep the charge cool" which in theory can work, especially at very low boost levels. My favorite part was using hotter spark plugs to burn off all the oil from the excessive blow-by.
Originally Posted by PorKen
I moved the BOV on my 928 MS 32V Raptor kit (3~4 psi boost) close to the throttle body versus next to the supercharger as an experiment. Moving the BOV vastly improved throttle response. Plus, before this change, each time the automatic shifted there was an unpleasant lag after the BOV dumped boost. Now shifts are crisp.
I can't say I ever noticed such lag, but then again never really spent much time driving kits with much less than 11psi. Also with an intercooler you really want the BOV before the cooler. Different BOV's can make a big difference too though.
AMAZING!!!! What kit did you use or did you just piece out yourself?
It was a 928 Motorsports stage one (non-intercooled) kit for 85-95 32V, installed for the PO by a shop. It has taken a lot of work to make it perform acceptably. Mostly due to the bad installation*, but also due to limitations of the kit. (I should make a separate thread about it.)
*EG. BOV connected to the vacuum line to the flappy
Last edited by PorKen; 07-19-2024 at 10:17 PM.
Reason: PO did not do installation
07-18-2024, 06:35 PM
