BobbyA

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Have just modified GS 400 with supercharger kit from Rod Millen.upgraded wheels (19 x 8.5 fr
19x 10 r SSR) Brembo 14" fr Apex exaust, TRD sway bar(fr & r) Strut towers (fr & r) apex AFC,
valve body, torque convert., limited slip diff., tranny cooler) hve been experiencing problems wit erratic and at times major hsitation mostly on downshift from automatic mode... cruising at 2,500rpm...5th gear..65-70mph..then mash accelerator to the floor and nothing happens.. all power cuts off completely, yet engine does not stall.. once let up must accelerate more easily.
I assume this is computer issue. My tuner is baffled. People at Millen are baffled. Anyone recommend a New York area tuner with strong diagnostic equipment/ and Lexus computer
experience. Anyone else have this problem?

ps. car works fine going from standstill and mash to floor. Shifts are all fine, acceleration excellent on the upshift. should'nt be injectors or AFC, or plugs etc.
(516)579-4767

DaveGS4

iTrader: (2)

Bobby,

Welcome to ClubLexus! I've got a GS very similarly modified to yours (RMM SC, brembos, 19" wheels, etc)

I'm moving your post to the correct forum - you put it in the classifieds.

I'd recommend you take a 2 hour drive down the road to Maryland and take your car to SRT. They've installed and tuned (at least) two RMM superchargers including mine. http://www.swiftracing.com/


Questions:
1) Are you using any sort of engine / air/fuel management?
2) Does the power cut out at or near redline?

TTurboPimp

iTrader: (12)

Dave is 100% correct, it would be well worth the drive. I had my GS tuned by three different shops it he MD area before SRT hooked it up, I gained roughly 30rwhp and the car ran perfect after that tuning session. By the way, it had the RMM SC kit on it as well.......Dave is real familiar with it.

TLW

having just made this trip its about 3-31/2 hrs

but well worth it

DaveGS4

iTrader: (2)

Oh yeah Johnny, you're right. I was mentally thinking about the drive I used to do from DC to Philly

tofu_house

iTrader: (2)

where did you find your RMM s/c... really looking into supercharging my GS and its been pretty hard to find a RMM supercharger now that they're discontinued...