LQ4 swapped S10 with supercharger installed and P0102

[CornDog]

I have a 1982 S10 that is LQ4 swapped. I had it running and driving for a year and then installed a m90 supercharger. after the install the truck starts and runs for a second then dies. I cleaned the LS7 maf and it did the same thing after. I had to change a lot of the vacuum lines and their routing so they are all routed to the top of the supercharger. I have an oil catch can and have the 2 valve cover ports going to the catch can and the top vacuum port going to the other catch can port. I don't know if it matters but I took the pcv valve out of the supercharger. I need to check for voltage at the mass air flow sensor but I can see that it's measuring cfm in the scanner. it doesn't run long enough to get much in the log file. marshal corwin 1982 S10 LQ4 timing lowered to 15.hpt

[gtstorey]

Add whatever log file you have. It helps confirm map sensor setup type things.

[blindsquirrel]

Good thing it's in 'MAF-only', cause it would never run with that VE table like that.

[gametech]

Good thing it does not run yet. The spark tables are going to be problematic. Not sure why the ls7 MAF on a setup that would never max out the original MAF. Not sure why the switch to 2bar sd and still running in MAF only, which will be problematic with a P01. I understand wanting low end torque, but an M90 on an lq4 is likely to be a belt slipping heat pump at the end of the day. A log of whatever you have would at least allow a sanity check of your sensor readings.

[blindsquirrel]

Heat comes from boost not rotor speed, one that small on a healthy-ish engine won't make enough boost to have high charge temps.

[SiriusC1024]

M90 on 6 liter lol.

[blindsquirrel]

A 1.9L LSA is only 115ci per rev.

[edcmat-l1]

A 1.9L LSA is only 115ci per rev.

LT4 is 1.7 litre

[Alvin]

blower displacement isn't everything.

M90's are like what was used on those old supercharged thunderbirds and 3800 GM motors.


When I was a kit I took a stock LT1 intake, cut the top off, welded a plate. Mounted a ford lightning 112 non intercooled. Made some fuel rails etc. Hacked a 2 bar OS for my 1993 SD $DA3. Made a solid 390 RWHP.. hot shit back then! lol

I still got it in the attic at our shop. I should snap some pictures for nostalgia.

This was in 2001-2003ish.

Around the same time magnacharger was selling non intercooled C5 kits with M112's. Those cars were lucky to make 480 rwhp if that. most in the mid 400's.

[CornDog]

2 17 pm on 8 may.hpl2 46 8 may.hpl12 04 pm on 6 may 2024.hpl1982 S10 LQ4 m90 maf mod 2 timing lowered fuel added.hpt



I've been scratching my head. the fuel trims are lean, like 25 and 50, I forget which is short term and which is long term. the maf has the voltage it should, the map has the voltage it should. I tried adding fuel to the maf table and that doesn't seem to have any affect.

richard holdener made 650 hp with a 5.3 LS engine and an M90 blower. I live in Wyoming and the elevation is 7k feet. is the air going to be hotter after coming through the blower? yes but not as hot as it would be on a 3.8 L67 or L32 with 12 lbs of boost. I don't know how much boost it will make, but I guarantee the 6.0 LQ4 will make more power with the M90 than it did NA.

[CornDog]

Good thing it does not run yet. The spark tables are going to be problematic. Not sure why the ls7 MAF on a setup that would never max out the original MAF. Not sure why the switch to 2bar sd and still running in MAF only, which will be problematic with a P01. I understand wanting low end torque, but an M90 on an lq4 is likely to be a belt slipping heat pump at the end of the day. A log of whatever you have would at least allow a sanity check of your sensor readings.

I cut the timing table in half with the tune I loaded a couple days ago. I cut the low octane table more than half. I already had the LS7 maf. I already had the 2 bar map installed. the truck was running good and driving just fine before the m90 install. I have the crank pinned and I should have enough belt wrap on the supercharger pulley to eliminate any slip. I don't think I'm in speed density, but that could be a problem.