t5 with a 350hp crate motor

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11-19-2006, 12:45 AM

1991ON20's

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Car: 91 RS, t-topped, man trans.

Engine: 350cid 350Hp crate motor

Transmission: t5 with new stock clutch and parts

Axle/Gears: 3.08 stock -RS

t5 with a 350hp crate motor

hey folks.....i just put a 350 hp crate motor in my 91 t topped RS. the trans is solid along with a new clutch and a few tranny parts. proffesionally installed.

The delemma is I can only go approx 55MPH in 5th gear(T5) before it red lines while cruising. SO at 55mph my rpms are showing approx 5ooo to 6000 rpms.

i wanna puch this motor alittle bit faster

how can i fix this?
is this normal?
----------
oh yeah this on on stock tires of course...235 55 16's

Last edited by 1991ON20's; 11-19-2006 at 12:45 AM. Reason: Automerged Doublepost

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11-19-2006, 08:43 AM

sofakingdom

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Car: Yes

Engine: Usually

Transmission: Sometimes

Axle/Gears: Behind me somewhere

Your tach is lying. Your motor is not turning 6000 RPM at 55 mph in 5th gear. You have 3.08 gears, if this was a 305 car originally: the motor is ACTUALLY turning about 1700 RPM under those conditions.

These tachs always do that. They fail by reading high.

Ignore it.

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11-19-2006, 09:16 AM

88 Z28 Guy

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Car: 1989 IROC

Engine: L98

Transmission: 700R4

Axle/Gears: 3.42 Auburn

Mine was doing the same, i got another tach.

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11-19-2006, 09:38 AM

JamesC

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Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

I've got a spare, 5000 red line, that read correctly (yeah, Sofa, I know) when removed. PM me should you be interested in a cheapie.

JamesC

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11-20-2006, 04:56 AM

Pat Hall

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The only other theory I can come up with besides a faulty tach is he's actually shifting into 3rd thinking it's in 5th. Lol.

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11-21-2006, 04:26 PM

1991ON20's

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Car: 91 RS, t-topped, man trans.

Engine: 350cid 350Hp crate motor

Transmission: t5 with new stock clutch and parts

Axle/Gears: 3.08 stock -RS

hey pat....west jordan,UT here!

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11-23-2006, 05:29 AM

Pat Hall

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Right on, another local member! Welcome to the site man. Let me know if there's any particular parts you need for your car. I've got quite a collection of misc. thirdgen stuff in my storage shed and garage.