Turbo 400 not enough rpms - Team Camaro Tech
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post #1 of 12 (permalink) Old Mar 14th, 01, 04:35 PM Thread Starter
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Location: Regina, Saskatchewan, Canada, Earth
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Question

I'm new to this veerry impressive site. I am in the process of building a 355cid (350+30) 420 hp(edelbrock rpm performer clone) to exchange and shelf the 327 in my 68. My situation is i'm running a turbo 400 stock converter for now (until is replaced with about a 2600 to 2800) that is shifting at about 5000 (pressure shifts at about 5500 but I don't like doing that). my question is how can I tweek this baby to shift at 6000 to 6500? I don't know if it has the long or short modulator. Is there much difference in them? For interest sake the rear end is still 2.73 until such time as I can get and install 3.73 to 4.10.
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post #2 of 12 (permalink) Old Mar 14th, 01, 05:28 PM
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You need a governor spring and weight kit. the only problem is I don't know where you can get one. Try calling TCI. etc it is easy to do but it is trial and error

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post #3 of 12 (permalink) Old Mar 14th, 01, 07:00 PM
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John
 
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Have you already bought the RPM cam? Lots of people here have said that it is very weak on torque in the street driving range.
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post #4 of 12 (permalink) Old Mar 14th, 01, 07:22 PM Thread Starter
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Talking

Thanks for the info guys! No I havn't ordered the cam yet. I have been considerering one from Comp Cams with a broader torque range but dosn't quite have the horses so still trying to decide. All I've done so far is had the 350 poked out and now is being finished honed (with torque plated and mains in) to the pistons. The RPM heads and Air Gap intake are on order. I still havn't gotten my crank and rods yet either so not yet balanced. Lots of work yet and $$$ tend to slow me down, but I want to do it up good so what the heck if it takes a little longer. Has anyone tapered their main bearings to load against thrust from a higher stall converter? I don't plan on going too wild on stall speed so not sure if really necessary. Also a little worried I might screw up the oil pressure altering the bearings. Any thoughts are more than welcome.
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post #5 of 12 (permalink) Old Mar 14th, 01, 11:34 PM
 
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is this a street car cause i know my car with 4:10s on a 3 speed it would run 3000 rpms at 55 mph so on the interstate i go 55 mph if i go any faster it sounds like it wants to blow or something but of course my motor wont rev very many rpms so u might be better off humm could it be short rods in a 400 sb yup probably good luck
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post #6 of 12 (permalink) Old Mar 15th, 01, 04:42 AM
 
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Get a modulater for a 78 1 ton truck then you can ajust your shift points look inside the mod you will see a small screw trun it about 7 times It,s there to make oid trannys shift harder .if you do this and don,t like it take it out and turn it some more until you get it the way you want it
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post #7 of 12 (permalink) Old Mar 15th, 01, 04:44 AM
 
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This will only cost about 10 bucks
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post #8 of 12 (permalink) Old Mar 15th, 01, 05:00 AM
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Now the tip you just got boys is why we need more old hot rodders around here!!!!

Nice tip MELROD!!!
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post #9 of 12 (permalink) Old Mar 15th, 01, 07:06 AM
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I don't think an adjustable modulator is going to get you enough difference to help. I have never been able to get much of a change in shift point only harshness. They are cheap give it a try. Vega's also used one if you can't find the truck one

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post #10 of 12 (permalink) Old Mar 15th, 01, 11:32 AM
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Robert
 
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I've been looking around at the electric solenoid type mechanism that work with your shifter. You can dial in the exact rpm you want and then activate it when you want. A little pricey though (check out the Jegs they have some info). As far as the adjustable modulator, I know one will change the shift points on a C6 f**d trans so I would agree you should give it a try.

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'69 getting better every day... (every pay day)
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post #11 of 12 (permalink) Old Mar 15th, 01, 02:26 PM
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Eric
 
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For what it's worth - I'm going through the same thing with my 68, TH350/383cid combo. The adjustable modulator got me up to 5000 RPM for the 1st to 2nd shift and 5500 RPM from 2nd to 3rd. It's maxed out now and I'm looking for that weight and spring kit Oger mentioned. I'll post the source if I find one.

[This message has been edited by Eric68 (edited 03-15-2001).]
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post #12 of 12 (permalink) Old Mar 15th, 01, 06:10 PM Thread Starter
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Thanks for all the input, fellow enthusists!
Your knowledge and input is invaluable.
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