[thadude]

My 93 Cobra is 3475 with me in it at 200lbs. This is with ¾ tank, all the spare tire junk, full interior, AL heads, MM a-arms, coilovers, PH/HDTQ arm/lowers, 331 BOSS 302 block, T56 w/Quicktime SFI bell housing, Stifflers cross member, AL driveshaft, stock wheels & brakes. Yours seems a little chunky but could also be the scale

Looking forward to the numbers on the nitrous.

 

[96pushrod]

You have to love the internet I tell you the car was running bad tell you what the data log even said and y'all say swap intake not get it tuned and bet she will do better I've already beat a guy running 11.8s without the 2 step its all a matter of fixing the tune. I have a Trickflow R sitting on the floor. Maybe next year I will put it on just to see how it does but I'm in no rush. Plan is get this bad boy tuned and back to the track make a good pass then put a little Nitrous to her and see how she does. When I'm done playing with the cobra intake I'll put the Trickflow on just for a short time to see how much better it does.

I wonder why you’re having issues with your megasquirt tune. Dropping to 15* is weird for sure.

I’m going to lean to agreeing that the box r is a far better idea than the ported cobra. Honestly I think the day you install it, you’ll wish you never bothered with the cobra one at all. My car runs hard as hell with the box and rockets with it on nitrous.

 

[2dxtrm]

I have done some street racing and I beat a guy that was running 11.8 @ 119mph so I had an idea. His car is very consistent. But I had changed wire today and pulled my intake off today. All I'm sure of is something wasn't right after it was going dead on me and it never does that and was going lean every now and then so maybe a vac leak bad plug. Not sure what I can tell you is she wasn't 100%.

So when I was coming off the Launch it was dropping down to 15deg of timing and about 3-4 points lean Through the run. Little tuning and I'm staying with my number. 11.5 @ 124mph (It hasn't done this but I say it will) Just like it sits.

I saw that video of you running that "11.8 @ 119 mph" car on the street, a couple weeks ago. Your car moved out hard....you beat him by what, at least 2-3 car lengths?

You changed what wire? And what was the reason you took the intake off?
Clearly your car has a problem with it dropping timing that low and running that lean (almost 16:1??!?? ).

Find and fix your issues and give it a go again.

 

[mikeymac]

4000 @ 32 deg blew the tires at 4000 RPMs. M/Ts S/Ss 315/35 r17.

Had no problems with traction problem was in the tune. I have a set of slicks on the shelf. As of now no plans to use them.

I think its cool that you kept the cobra intake on your cobra. It seems now your goal is to run an 11.5. You ran 112 mph, granted your tune maybe off, lets say you pick up 3 mph with a tune and more practice. 115mph... to run an 11.5 you will need to 60' that thing. Like low 1.5x's. Not going to happen on that tire with a stick car. Good luck.

 

[Str8ballar]

I saw that video of you running that "11.8 @ 119 mph" car on the street, a couple weeks ago. Your car moved out hard....you beat him by what, at least 2-3 car lengths?

You changed what wire? And what was the reason you took the intake off?
Clearly your car has a problem with it dropping timing that low and running that lean (almost 16:1??!?? ).

Find and fix your issues and give it a go again.

Yea, I don't think Corral understands just how bad my car was running. It was bad. Yes I beat him by about 2 and had let out of it. This is why I think my car will do 124-125mph

I was wiring up the nitrous to the computer and wiring up the Launch. Before it was on a Maximizer and a MSD for the 2 step. I had swapped between some tunes and may have mixed something up. I'm really still learning to use the Megasquirt thats why I logged it and the guy helping me tune looked at it the next day and said I have a good sec left in the tune.

I pulled the intake off because it has a whistle and I know it was most likely my IAC but I wanted to double check and make sure the Vacuum tree wasn't letting air by.

 

[Str8ballar]

I think its cool that you kept the cobra intake on your cobra. It seems now your goal is to run an 11.5. You ran 112 mph, granted your tune maybe off, lets say you pick up 3 mph with a tune and more practice. 115mph... to run an 11.5 you will need to 60' that thing. Like low 1.5x's. Not going to happen on that tire with a stick car. Good luck.

You maybe 100% right on needing the slicks but I really want to see what the 12.5in of Radial can handle. I have the slicks. On Radials the car dead hooked at 3500rpms with full timing it just fell on its face right after.

 

[bmeyer40]

When you swap intakes I'll try your max ported setup against the stock explorer back to back.

I do like what you have done as far as establishing the actual limit of that intake.

Sent from my SM-G960U using Tapatalk

 

[stangjumper]

My 90lx/saleen with vortech weighed 3500lb on a certified scale with my 175lbs in seat.

I know there are a lot of variables: my aod, single turbo 352 dynoed 505rwhp at 5psi on a dyno dynamics dyno. At the track it ran 10.50 at 130mph with a 1.41 60ft.

 

[AlexLTDLX]

How many mph do you expect to get from the right tune?

^This. Like I said in my post, I had a miss too - you can see it in the dyno graph - that's the hole. It came from Megasquirt VASTLY overrating their ignition VR pickup capabilities. I didn't get it sorted until I switched to a Cherry hall-effect sensor crank pickup, which didn't happen until after I put the blower on. So my timeslip above (117 mph with a glide, ultra-tight converter - 10" with a steel C Stator - setup for the blower) is with the massive miss.

Here's what the EXACT SAME dyno graph looks like without any smoothing:

Yes, the curve goes backwards a bunch of times. The converter smooths out the graph until it starts coupling; with a stick it would be much worse. Even if you're so fat you're running down the strip like a diesel rolling coal, the most you'll see is maybe 1-1.5 mph (been there, done that too). Retarded timing on leave? Maybe .5-1 mph. You'll likely gain more ET, because of the potentially better 60', assuming adequate traction.

Tom asks a good question - how much do you actually think you'll gain from a decent tune? 112 to 124 mph is 12 mph. I'd say that's not happening. Not even close. I'll give you up to 3 mph with a decent tune, and mineshaft air, but my 1,000+ dragstrip passes worth of experience says not much more. If you run 124mph N/A with a GT-40 intake I'll personally pay for and send a hooker to your house to give you a BJ. You can go to the track and prove me wrong, but I'm pretty confident I'm not far off. The bottle neck is the intake. If it wasn't, and all people needed to do was port GT-40 intakes, how many $700 - $800 high-zoot intakes do you think the aftermarket would sell? There's more to it than questionable flow numbers. Runner length is still way too long. Reverse taper (which you have) causes reversion between power strokes, and hampers dynamic flow. That's just the tip of the iceberg.

I'm not attacking you, and in fact I applaud you for actually getting real data. I love that. And I encourage you to prove me wrong. I may be. As far as you know, I'm just some a-hole with a keyboard. But I'm sharing my experience and data with you for hopefully a positive outcome. FWIW, I don't think the Trick Flow R is that good of an intake. Slo 50 (Dean) on here tried both on his 363 and saw significant gains with the Box R over the regular R.

HTH.

 

[AlexLTDLX]

BTW, if you need help with the Megasquirt, I can help you. I've been running an MS3x for several years and encountered a ton of issues. I'm not an MS leghumper, as such, the actual leghumpers hate me, because I've called out all the faults I've seen on their forums. I've wired in snubbing caps, modified the unit internally, etc. It's a good system, but getting it running right on anything other than an 80 hp Volvo can be trying, to say the least. Just PM me if you're interested, I'll be happy to go through your tune and datalogs and see what's up.

 

[2dxtrm]

Yea, I don't think Corral understands just how bad my car was running. It was bad. Yes I beat him by about 2 and had let out of it. This is why I think my car will do 124-125mph

I was wiring up the nitrous to the computer and wiring up the Launch. Before it was on a Maximizer and a MSD for the 2 step. I had swapped between some tunes and may have mixed something up. I'm really still learning to use the Megasquirt thats why I logged it and the guy helping me tune looked at it the next day and said I have a good sec left in the tune.

I pulled the intake off because it has a whistle and I know it was most likely my IAC but I wanted to double check and make sure the Vacuum tree wasn't letting air by.

Get your MS tune files sorted out and undo whatever wiring you did. Make sure your fuel pump is getting the proper voltage too. Basically put it back to the way the car was when you ran that E55. Launch the car the same way on the track as you did on the street with those drag radials.

 

[Impetuous]

I would be interested to take a look at your tune file. I tuned mine myself with microsquirt and it has been great to me.

 

[JClausen]

Hey Str8baller,

The weight of your car if that's with driver makes sense. When I built by 363 I picked up over 100lbs due to the extra meat in the DART SHP block and my new A5 trans / SFI bell housing was heavier as well. You will have the same with the switch to T-56.

If you pulled the intake off before the track I would ensure you used new gaskets there and ensure to heat cycle and then retorque the intake cold for the upper and lower gaskets. On a new build its very common for vacuum leaks here and the lower manifold bolts loosening after a few heat cycles, ensure you use the torque sequence in the manual as well. I torque them 1-2 times after a few heat cycles between checks and they quit moving and are good for the long haul after that. I would also pull plugs and check and replace them before your next outing to ensure best results and that the vacuum leak didn't foul anything out. also gap is important as well I run .040" for reference on my setup.

Once the manifold is sealed up well get your tune right and ensure shes in good running condition before your next track outing to get a good gauge on your current performance. the fact that the MPH and the dyno and weight are lining up with the uncorrected numbers though I wouldn't expect huge gains in trap speed. there is a bunch of time in the 60' though so slicks, suspension, and gearing optimization will gain alot of E.T. regardless. With a more suitable intake on the car, shifting it at higher RPM with the new intake, real 1-3/4" to full 3" collector headers / exhaust on the car and only a few other changes you will likely pick up your MPH in the 125-130 range, but if your goal is car show / street scene and such you may not care on the track numbers too much. Good luck with your project.

 

[Putyoutorest]

The intake without the spacer is fine and not holding the car back. It's not a typically ported Cobra and has plenty of CSA and flow to support well over what this engine in this trim can make. If you saw it in person you would understand. The car will make good hp even though it has 2.5" collectors and a mild cam for a 363. Exhaust flow is more important than many understand. We have seen many times on the dyno and track how exhaust flow mods can greatly improve hp and track times. With slicks, good driving and tune/running right the car can hit high 10s in the 119/120s range. With the DRs I believe it can run 11.50s.
OP will get it all sorted out and comeback stronger.?

 

[Str8ballar]

Well I am hoping to do another dyno run in the next few weeks. Spacer is off Have a 80mm TB and the port on the intake is 80mm. Its tuned very well and I should be doing a 100shot and maybe a 250shot. Not sure about getting a track time due to most of them are closed. This should be the last trip to the dyno I hope. Then its all track #s

 

[Str8ballar]

Well until I try this bad boy out.

 

[AlexLTDLX]

80mm TB will show no real difference. I tried a 65mm ported explorer vs a 75mm aftermarket on my setup and there was no real difference. The GT40 simply doesn't have enough volume in that area that even if it made a difference, it still wouldn't be the choke point. But love the experimentation and the data. Keep it coming!

 

[CDW6212R]

Well until I try this bad boy out.
View attachment 1058232

How well does any intake emblem lay on the TFS upper intake? What might it look like to mount one on that, given the many choices that have been available?

That's one reason I've been reluctant to jump to an RPM II for my 347, the intake top, I'm not interesting in advertising for any company. The OEM intakes there are many choices to put on top of them.

 

[tmoss]

........

 

[96pushrod]

That's one reason I've been reluctant to jump to an RPM II for my 347, the intake top, I'm not interesting in advertising for any company. The OEM intakes there are many choices to put on top of them.

Must suck to feel this way lol.