Sooo close but need some input..:D

Discuss the RB20, RB25 and RB26 series engines.
craz4240
Posts: 738
Joined: Wed Sep 13, 2006 4:23 pm
Car: 1995 240sx w/rb20det
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Car is

1995 240sxRB20DETCustom Built RB25 turbo3" turbo backZ32 MAFSMAzda Series 5 RX-7 injectorsTuned ROM by Carl HInnovate WidebandGTR intercooler2.5" piping all welded (only 3 couplers with t-bolts)

For the record I still have to set my timing and idle switch.I do have the cam angle sensor set directly in the center of the bolt holes.

Car starts and seems to idle smooth (but high) when cold,but it gets choppy when the temperatre rises to operating temps and worse as it gets warmer.Also when cruising it doesn't seem to have as much power as it should but is not overly laggy (have only boosted it to 10psi).Also when I have the gas in about 15-20% the car runs smooth but when I let off wile cruising it breaks up then stays broke up till I hit that sweet spot in the throttle again.

EGT's do seem high but I don't have a wideband,haven't driven the car much so the exhaust mani isn't glowing or anythng.

Just wondering what you all think I know I have a couple things to settle but not sure if they will help these issues.

I have my suspicions like TPS,and possibly MAFS..however I used the Z32 FSM and checked the MAFS signals and they are within spec.Any help would be appreciated guys I am soo close to driving this thing.


Yellow4g63
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Joined: Mon Jan 20, 2003 6:07 pm
Car: 95 Nissan RB20 240SX RB20
91 Nissan NX2000 VE power
95 Nissan 240SX Stock
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could be a coolant temp sensor going bad. Buy the 300zx one and try that out. I forget how much it cost....$25? $10?

craz4240
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Joined: Wed Sep 13, 2006 4:23 pm
Car: 1995 240sx w/rb20det
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Thanks man gonna give it a shot...... Any other ideas guys?

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ANVIL
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Car: RB25DET S13.5
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is the ROM tuned for those injectors you have?

craz4240
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Joined: Wed Sep 13, 2006 4:23 pm
Car: 1995 240sx w/rb20det
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Well of course it's tuned lol hehee

TSL
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Joined: Wed Apr 02, 2008 3:24 am
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craz4240 wrote:Z32 MAFSMAzda Series 5 RX-7 injectorsTuned ROM by Carl HInnovate WidebandGTR intercooler

EGT's do seem high but I don't have a wideband,
Do you have one or not? Check the fuel mixtures.
craz4240 wrote:For the record I still have to set my timing and idle switch.
That would be a good start.

craz4240
Posts: 738
Joined: Wed Sep 13, 2006 4:23 pm
Car: 1995 240sx w/rb20det
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TSL wrote:
Do you have one or not? Check the fuel mixtures.

That would be a good start.
Sorry the wideband thing I should have elaborated...it's in the car b4 the sensor craped out it was seeing about 14.5:1 at idle.The sensor crapping out was totally my fault had my fabricator weld the bung on my downpipe exactly where I told him to unfortunatley the sensor set up right against the frame .Anywayz bad frig up but the sensor worked long enough for me to start the car run it and check afr.

As for idle and timing well yeah it does need to be set but I don't think its the issue with the messed up idle...not ideal to drive yes but I won't be driving it until I get that stuff done this weekend.


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