Chevelle is about to get a big power upgrade - Page 2 - Chevelle Tech
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post #16 of 30 (permalink) Old Dec 26th, 19, 2:01 PM Thread Starter
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lf it helps I believe I’ll be using these heads as I already have them. “ they came in the giant pile of parts I got” if they are not going to work I’ll sell them and get something better suited. I’m open to knowledge s a lot of this is over my head and new to me right now. Big comp turbos trick heads ect ect. My thinking is I already have a lot of these parts I might as well build something serious to play with.

18475136 – Assembly Super Mod Port 424cc 2.400/1.900 1.625D 4.600
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post #17 of 30 (permalink) Old Dec 26th, 19, 2:17 PM Thread Starter
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Some pictures of the new toy. I’ll most likely be putting it in this vs the chevelle.
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post #18 of 30 (permalink) Old Dec 26th, 19, 2:30 PM
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Re: Chevelle is about to get a big power upgrade

First thing I'd do is see if the chassis certifies. No point going crazy if the car won't be legal.

Ray


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post #19 of 30 (permalink) Old Dec 26th, 19, 2:48 PM
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Re: Chevelle is about to get a big power upgrade

Definitely donít go too low on the compression, youíll just make it a slug off boost and slow to spool. I go at least 10.0-1 for my forced induction builds.... you can easily loaf around on pump gas, low boost with that compression with good timing control.

Also, no reason to spray on top of twin turbos, all you are going to do is melt ****. A 500Ē engine will have no issue spooling some properly sized turbos, and they will damn sure make enough power on their own.

All the nitrous will really do is narrow your tuning window, leave no room for error or any type of equipment failure. Now if you were trying to spool an 88mm with a 3.0l engine, then yeah spray it just to get it to spool but...in your build, youíre just asking to melt down a high dollar engine.


On the fuel, if there is anyway you can run E85, I highly recommend it. Otherwise, one tank for 93 and one for C16 is a good idea. Iíd just keep the boost really low on 93 only....or even think about a methanol injection system to help out when you are on 93 oct.

For intercooling, are you going air to water or air to air? This will affect your pump gas tune up for sure.

There is about a million factors to this build, nitrous should not be one of them.

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post #20 of 30 (permalink) Old Dec 26th, 19, 5:04 PM Thread Starter
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The main reason for the spray was I was thinking of using it on a low setting, under boost to cool the iat instead of meth injection and as a bonus pick up a little power. Mostly because I already have the system and a few Bottles. Bad idea?
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post #21 of 30 (permalink) Old Dec 26th, 19, 7:19 PM
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Alan
 
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Re: Chevelle is about to get a big power upgrade

Quote:
Originally Posted by 71malibuu View Post
The main reason for the spray was I was thinking of using it on a low setting, under boost to cool the iat instead of meth injection and as a bonus pick up a little power. Mostly because I already have the system and a few Bottles. Bad idea?

Terrible idea.

Although it ďcanĒ cool the incoming charge, once it hits the cylinder and releases the O2, combined with boost, itís just additional airflow and potential for more detonation.

Since itís a direct port, there wonít be much ďcoolingĒ of the charge anyway.


Lots of people spray on top of blower combos because the blowers are out of air flow..... and sure it works... turbo setups are different. Yes itís possible to do it but....itís really not needed and an unnecessary risk on a brand new motor.

I mean youíll easily make 1200+ rwhp and potentially a lot more depending on what your turbos are.

We have 5.0 Mustangs down here running 8.teens at 170 mph, at 4000lbs with 302Ē and twin 6266s on pump E85.... simple combo that works.

You have a way lighter car, way bigger motor....Iím sure larger turbos...

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T400, Tight 10" converter
3.36 gears, 3700lb raceweight
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post #22 of 30 (permalink) Old Dec 26th, 19, 8:55 PM
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Re: Chevelle is about to get a big power upgrade

Quote:
Originally Posted by 71malibuu View Post
lf it helps I believe Iíll be using these heads as I already have them. ď they came in the giant pile of parts I gotĒ if they are not going to work Iíll sell them and get something better suited. Iím open to knowledge s a lot of this is over my head and new to me right now. Big comp turbos trick heads ect ect. My thinking is I already have a lot of these parts I might as well build something serious to play with.

18475136 Ė Assembly Super Mod Port 424cc 2.400/1.900 1.625D 4.600
I would order this book and do some reading :




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post #23 of 30 (permalink) Old Dec 27th, 19, 12:48 AM Thread Starter
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A lot of good information. Thanks for the input. The manifold with the direct port may just end up on the chevelle after all. Also apparently the heads that I have, I’m being told are not the way to go as I’m going to need custom pistons, and everything else above them. Intake valve covers the whole deal. Decisions decisions.

Something I’m tossing around, considering my 489 in the chevelle has less than 1500 miles on it, it’s all forged and balanced, solid roller, and compression is 10.4:1 would either
1. putting the new manifold with the kits on it
Or
2. Putting these new turbos on the chevelle be a viable option for this season?
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post #24 of 30 (permalink) Old Dec 27th, 19, 9:36 AM
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Alan
 
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Re: Chevelle is about to get a big power upgrade

Quote:
Originally Posted by 71malibuu View Post
A lot of good information. Thanks for the input. The manifold with the direct port may just end up on the chevelle after all. Also apparently the heads that I have, Iím being told are not the way to go as Iím going to need custom pistons, and everything else above them. Intake valve covers the whole deal. Decisions decisions.

Something Iím tossing around, considering my 489 in the chevelle has less than 1500 miles on it, itís all forged and balanced, solid roller, and compression is 10.4:1 would either
1. putting the new manifold with the kits on it
Or
2. Putting these new turbos on the chevelle be a viable option for this season?
You could definitely throw the turbskies on the 489 in the car, but at a minimum, change the cam over to a turbo grind. It will help with spool efficiency big time, make more power and drive much better around town.

Invest money in a good fuel system. I bet you can make 1000 rwhp pretty easy with the 489 and the right turbo setup. Again E85 is your friend.

E85 is the difference between making a safe 1000 rwhp or a sketchy 700 rwhp on 93.

Do your research, study up and make small moves on the tune up.

You didnít mention if you are using a blow through carb setup or going EFI but, this also has a huge effect on the build plan and cost.

1971 Corvette
VortecPro 496"
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post #25 of 30 (permalink) Old Dec 27th, 19, 2:03 PM Thread Starter
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It will be blow through if I do the turbos on the chevelle. E 85 is not an option as I haven’t seen a single station anywhere near me that has it. It’s a real street car so I do drive it and need fuel from the pump. I’m starting to lean more towards putting the nitrous manifold On the chevelle and getting that tuned in, and progressing slowly with the turbo motor build. Issue being that all of the local dyno guys are efi and or ls. Any good carb tuning dyno shops around mass?
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post #26 of 30 (permalink) Old Dec 27th, 19, 2:07 PM Thread Starter
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Also race gas is ok for the track. But pump on the street. I have a 14 g cell with 2 200 gph pumps and 7/8 lines/filters. I’m in the process of installing it in the trunk of the chevelle for race gas, and I’ll retain the mechanical pump and factory fuel tank for street duty.
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post #27 of 30 (permalink) Old Dec 29th, 19, 5:41 PM Thread Starter
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Got the carb I’m going to use on the chevelle just have to put the correct bowls back on. He has apparently switched them onto a different carb. and finished porting the intake manifold to match the heads. Carb is a pro systems nitrous dominator. Not sure of cfm I’m trying to find out more about it. If anyone knows what it’s all about that would be a big help.
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post #28 of 30 (permalink) Old Dec 29th, 19, 6:38 PM
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Re: Chevelle is about to get a big power upgrade

If its a Prosystem there should be build number stamped , with that number you can call them and get the carb build sheet with all the specs
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1969 396 SS monaco orange (72)
468 Vortecpro 585 HP back to street cruiser
M20 4 speed - 3.31
Prosystems 1000
BEST ET 11.62 (with 4.10)
BEST MPH 121
BEST 60 FT 1.64
4000 lbs street car


1969 El Camino Street Strip
467 Vortecpro Tunnel ram 730+ hp TH400
BEST ET 10.67 @ 127 1.56 60FT
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post #29 of 30 (permalink) Old Dec 29th, 19, 10:15 PM Thread Starter
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I’ll be doing that this week. Thanks for that. The number I believe is stamped right on top.
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post #30 of 30 (permalink) Old Dec 30th, 19, 3:45 AM
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Re: Chevelle is about to get a big power upgrade

Quote:
Originally Posted by 71malibuu View Post
Iíll be doing that this week. Thanks for that. The number I believe is stamped right on top.
yes it is on top each carb is custom made , they could even modify it for your application

Oliver
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1969 396 SS monaco orange (72)
468 Vortecpro 585 HP back to street cruiser
M20 4 speed - 3.31
Prosystems 1000
BEST ET 11.62 (with 4.10)
BEST MPH 121
BEST 60 FT 1.64
4000 lbs street car


1969 El Camino Street Strip
467 Vortecpro Tunnel ram 730+ hp TH400
BEST ET 10.67 @ 127 1.56 60FT
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