92 740 Turbo

Started by TxS70, Jul 02 2009 04:18 AM

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#1 TxS70

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Posted 02 July 2009 - 04:18 AM

Ok, so Im driving along nice and easy. Then, I need to punch it to get out of the way of some MORON in San Antonio. I down shift (5 speed) and punch the gas. The car pulls away like it always has, but then the car lurched forward. I checked the gauges, the boost gauge was in full vacuum, the RPMs held steady.

I took my foot off the gas, and it seems that power was restored. It does this only at 3/4 or more (per gauge) boost as I am nearing 4k RPM. If i pop it in first and slowly raise the RPMs, I can get it to the red line without issue, its only under heavy throttle and boost.

I took off the hose that connects the AMM to the turbo, it is weak and flimsy near the connection at the turbo.

I have checked vacuum lines, all seem ok.

Can the hose be collasping due to the vacuum created by the air moving into the turbo?

I should add that the car drives FINE in every day driving, its ONLY under full throttle I have this issue.

No other problems, smooth idle, easy start, no smoke.

'98 s70 5 Speed-Wrecked by a girl without insurance!
02 s60 2.4t ~105k Looking for mod ideas!

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#2 Naughty33W

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Posted 02 July 2009 - 05:47 AM

fuel cutoff maybe ?

2003 Volvo S60 2.4T --- Favorite VS quote - "28 psi boost spike = ... fu** me lol" - by: 83' Turbo
18x8" OZ Wheels in Black , Gutted Interior , Smoked Windows , And Yes ... Hood Pins ...
Engine Build: 16T + Garrett WGA + Mishimoto FMIC + 3" Catless (Meow) TurboBack Exhaust + Tweaked ST 17psi Tune

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#3 Three Fat Tigers

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Posted 02 July 2009 - 02:05 PM

I'd bet it has to be the turbo inlet hose collapsing under suction. Try a few plastic tie straps around it, and or insert a coil of hanger wire inside.

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#4 TxS70

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Posted 02 July 2009 - 04:13 PM

Meh, I have the new hose coming from the indie today. I had another 740 turbo, same problem, same fix. *FIngers crossed*

Also, I noticed my wastegate rod clip was broken, and in the process of trying to get a new one in, the rod has slipped off the wastegate connection. Easy fix? I cant lift the car, and I cant see it from the top...

'98 s70 5 Speed-Wrecked by a girl without insurance!
02 s60 2.4t ~105k Looking for mod ideas!