Author Topic: MPH drop  (Read 14060 times)

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Offline Steve Wood

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Re: MPH drop
« Reply #15 on: June 20 2019, 10:14:51 AM »
LOL...and I would think what a nice day :rock:
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Re: MPH drop
« Reply #16 on: June 20 2019, 10:33:49 AM »
On Earl's link they were talking 50C. approx 130F.  Where is ambient that high?
Seems to me the new Dodges have some good working systems and the aftermarket have improved on those.


85 in Texas IS a nice day but when you live in the great lakes area not so much LOL.

Offline Steve Wood

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Re: MPH drop
« Reply #17 on: June 20 2019, 11:56:13 AM »
I think he was using 50 as the ambient temp of the IC under the hood rather than air temp as most of us would think.  I don't think 130 is too far off from what I see around here in the warmer months.  Air temperature right off the pavement is a killer


It's been unusually cool around here so far, but, forecast is for more than 100 today and it is still humid so the heat index is about ten degrees higher.
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Offline Tim Hensley

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Re: MPH drop
« Reply #18 on: June 20 2019, 03:48:25 PM »
On first pass intake air temperature was 101 at time I let the brake go.
Last pass it was 127.
I’m happy with 11.5 pass that was my goal. You look at the times slip and say ok just a little more and high 10. Couple years back I the tech guy made mention when I was running consent 11.80sto watch it. 
Maybe it’s time to focus on my reaction times.
I think it’s time to give Lonnie at Extreme automatic two thumbs up on trans and converter.  He did it with a Sprag so I can drive it anywhere any time without haven a heating problem.
Thanks everyone I’ll keep adding low gear timing tell I get a little Kr and back off a few numbers
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Offline wmsonta

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Re: MPH drop
« Reply #19 on: June 20 2019, 04:03:02 PM »
just a little more and high 10.
In a perfect world, about 70 hp to go 11.0.

http://www.wallaceracing.com/et-hp-mph.php

Offline daveismissing

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Re: MPH drop
« Reply #20 on: June 20 2019, 09:09:22 PM »
Those FB threads ,Rob Ortosky, Ken White and others - some good stuff in there. Wish my retention was still up to snuff.
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline Grumpy

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Re: MPH drop
« Reply #21 on: June 20 2019, 10:04:22 PM »
Particularly when spraying alky, I notice that some of the guys that actually measure temps and such stuff are beginning to go back to stock location intercoolers and are still knocking on the door to the 8's. 
I was a firm believer on stock location intercoolers. We went back to one in Melissa's.  :rock: Down to 9.1s now.
Tim now it's time to work on the suspension. ummmm.. Are you goin to just keep it at mid 11s ?

Offline earlbrown

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Re: MPH drop
« Reply #22 on: June 21 2019, 04:35:32 AM »
Earl, I don't think I have seen that particular article before.  It sums it up nicely altho' I am sure that 90% will want to argue about what color to paint the intercooler to make it cool better.


I think I will save the candles after my next seance. :tongue


Phase change is neat shit when it works in our favor.   That's a LOT of energy that can harnessed for both good and evil.


A nice insulating paint layer to ''aid'' in radiation on the other hand....



...and Ive found a good source for wax is nipples.    :D
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Offline Tim Hensley

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Re: MPH drop
« Reply #23 on: June 21 2019, 05:50:41 AM »
I have a old 15 row Action SLIC not planing to replace it.


Good question about staying med 11s ,I have a nice 87 and installing a roll bar ,Could cost a arm and leg here and might not be that nice of a job.Not saying it couldn’t be done, just pessimistic.


At 1.687 60 no 10 potential yet, but my suspension modification so far it sticks the tires most the time.


Lonnie and Julio recommend loosing the converter, but it’s street manures are so good. They also said  I need to keep working on the tune. Going back this weekend adding more timing in 1st and 2ed. Once I get my A/F with no KR in 1-2 I’ll start on high gear tune. 


Baby steps I have a 2step but I’ve gotten this far without it.When  I got it my 60 had no improvement with or without it ,just another dodad to confuse me ,but it’s rev-limiter as save me a time or too.
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Offline Steve Wood

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Re: MPH drop
« Reply #24 on: June 21 2019, 09:55:46 AM »
I have come to the conclusion that tuning is really a lot more simple than we make it to be with today's modern chips.  Gorilla tuning will get you 99% of what days and days of fine tuning will bring you :)


1) if you can leave at 10-12 psi of boost, or better, without undue spooling delay on the line, then your converter is close on stall.  I suspect the rpm will flash well into the 3000's and probably closer to 4000.  Upon launch, it should flash to about the same rpm as it drops back to on the shift to second and third.  Modern converters seem to be able to do this and still feel responsive in normal daily driving.  I hate that "give it some gas and wait for the car to start moving" feeling.


2)Don't try to run the max timing in low gear that you can get without KR.  Run enough so that the car will spool easily.  Eric's chips are often too rich on the default so pull as much as required to get the revs to come up easily along with the timing.  You don't want to heat the chamber in first and second more than you need to in order to get the car to launch.  Any more just increases the likelihood of KR in third gear where the increased load on the engine and high chamber temps don't go together.


3) Don't worry about third gear timing.  18 degs will probably work as well as anything.


4) Stay in the power-band of the engine.  Don't try to push the upper rpm limit.  It's a turbo car.  Boost is king and anything else is a pawn.  Yes, I know the difference between flow and boost but we are only working with one turbo and one engine combo at a time.  Just try to stay within the efficiency window for your turbo.  If you increase boost and the intake temps take a steep jump, go back down.


5) learn to drive the car that you have...find out what works with it, not some one elses in other words.


6) The more alky you spray, the harder it is to optimize the launch, but, the safer the engine is on top end.  Also, the more alky you spray, the less sensitive the tuning will become for A/F ratio.


Speaking of A/F's, I suspect that low gear should be around 11-1 and third gear should be around 10.8-1.  Getting too rich will kill acceleration, getting too lean can cause strange noises.  I suspect the fast alky cars are running egts around 1650 at the big end.


Your slic is fine. Watch who is running what at the nationals this year in the alky class.  Slic's are easier to tune and more responsive on the street.   


Quick street cars are a helluva lot more fun than real race cars unless you are just an old fashioned masochist at heart.



« Last Edit: June 21 2019, 10:17:40 AM by Steve Wood »
Steve Wood

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Offline Steve Wood

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Re: MPH drop
« Reply #25 on: June 21 2019, 10:00:23 AM »
Earl Brown, Life would be so monotonous without people like you around!k  Gonna wax up my nipples tonight and hit the bars!  NOT
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Offline earlbrown

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Re: MPH drop
« Reply #26 on: June 21 2019, 03:17:51 PM »
You'll strain your neck less, if you harvest the wax from a nipple donor.
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Steve Wood

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Re: MPH drop
« Reply #27 on: June 21 2019, 03:49:49 PM »
I would like to say, "I hear that!"  but I don't
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Offline TexasT

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Re: MPH drop
« Reply #28 on: June 21 2019, 06:46:48 PM »
85*, haha, try triple digit temps . 85* is a holiday.

https://m.youtube.com/watch?v=5ZftFnLMnwc
I listened to a podcast just this am about intercoolers and such. They had some opinions on em and intake temps with different fuels
Rich

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Offline Tim Hensley

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Re: MPH drop
« Reply #29 on: June 22 2019, 02:41:49 AM »
https://youtu.be/sMt6DbB4PdI
 My 85 degree day
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