[tyang82]

Dear Supra Pros,
Im in the process of rebuilding my 7mgte and i need help to the best parts for creating 500+hp. If i get the CP pistons with Eagle Rods, can i use stock Valves, seals and springs?

 

[TMMCsupra]

I'm not being an ass, but why would you want to use old parts on a new rebuild? Why not upgrade everything while your in there? Especially if your goals are over 500hp. Again, I'm not an expert here, I'm just sayin.

 

[tyang82]

im sorry if i wrote it wrong, but i meant can i use regular springs and valves from toyota on cp pistons and eagle rods, or is it best to get aftermarket parts?

 

[adam pecush]

Depends how high you want to rev the engine.

Stock rev, no problem. 7500, you might want to upgrade the springs and retainers that is if its apart.

 

[tyang82]

Thanks Adam, i needed that. sorry, im a newbie at this and i wanna do it right.

 

[aaronc222]

I upgraded to Comp Cams valve springs while my head was apart and am very pleased with the improvement over 200k stock springs.

 

[tyang82]

thanks aaronc222

 

[tyang82]

thanks aaronc222, what about your valves?

 

[adam pecush]

I upgraded to Comp Cams valve springs while my head was apart and am very pleased with the improvement over 200k stock springs.

define improvement over stock springs

(not trying to flame, just wondering)

 

[sixpack]

+1 on the Comp Cams springs.
P/N 975-12 (for 12 springs) at $25 per box + shipping from Summit Racing.
(you will need 2 boxes)
williamb82 has some for sale in the MkIII for-sale section:
http://www.supraforums.com/forum/sh...d-gm-trans-adaptor-etc...-for-sale&highlight=
Has valves too......

 

[aaronc222]

define improvement over stock springs

(not trying to flame, just wondering)

The engine is MUCH smoother over 3000 RPM than it used to be. Not a power improvement just a smoothness improvement.

And I did not do the valves. From all the research I did larger valves aren't necessary below 500 HP in the 7M so I just cleaned my stockers really well and put them back in with fresh stem seals.

 

[sixpack]

define improvement over stock springs

(not trying to flame, just wondering)

Stronger, and will take more lift.

From my data files:

Stock:
30lbs @ 34mm
36lbs @ 33mm (shimmed 1mm)
80lbs @ 26mm
87lbs @ 25mm (shimmed 1mm)

Comp Cams p/n 975-12 .697"ID, .953"OD
(TODA is .941"OD - Comp spring will press into bottom cup)
55lbs @ 38.1mm
60lbs @ 37mm (No OEM spring seat, just .015" shim with TODA inner shim) - TRD 10.75mm lift cams
77lbs @ 34.3mm
120lbs @ 26.5mm (No OEM spring seat, just .015" shim with TODA inner shim) - TRD 10.75mm lift cams
127lbs @ 25.4mm (this per comp cams)
Spring rate: 144 lbs/in. (5.67 lbs/mm)
Coil bind: 24.13mm
http://www.mkiiitech.com/forums/viewtopic.php?t=359

 

[SideWinderGX]

+1 on the comp cams springs, runs much smoother in the higher revs and doesn't taper off like it used to (as much).

sixpack: those stock figures, thats for intake/exhaust?

 

[sixpack]

+1 on the comp cams springs, runs much smoother in the higher revs and doesn't taper off like it used to (as much).

sixpack: those stock figures, thats for intake/exhaust?

Yup.
I have never seen a difference between the stock In & Ex springs.
Same wire diameter, and over all length.

 

[SideWinderGX]

Sounds good, thanks!