Help w/slow mph from 1/8 to 1/4.

[94RedReaper]

Went to track w/SRT-4 and ran these numbers:

60ft.........2.039
330..........5.724
1/8..........8.666
1/8 mph...85.64 :thumbup:
990.........11.165
1/4.........13.395
1/4 mph...104.35 :thumbdow:

Mods. S1, AGP hooked to blue line 18psi to 15psi @red line, 3" side exhaust, 180 stat, 225/15/50 BF Good DR's,STS, Mounts, HKS BOV, stock plugs gapped at .46

Ran 94 octane w/3 gallons of 103 unleaded race gas. Did not WOT shift.

With the 1/8 mph, my 1/4 trap should be higher. No sign of detonation on the plugs. I don't think I have a boost leak. Boost holds fine. Can't figure it out. Any help please.

[TalonTsi97]

Mike times arent to bad, but i guess check over everythign and see if somethign is messed up.

When are you going to be comign to a meet on thursday?

[94RedReaper]

Mike times arent to bad, but i guess check over everythign and see if somethign is messed up.

When are you going to be comign to a meet on thursday?

Hopefully soon. I've been at the track the last 3-4 weeks on Thursday. I'll be at the shore this Thursday. I still haven't been to the new place yet.

Times aren't bad, but the 1/8 mile mph indicates the 1/4 mile mph should be higher. Something must be happening up top. Pulled timing, slight detonation...?

[2point4DSM]

That's pretty awesome you guys can gap your plugs that large. DSMrs gap their plugs at .028.

Why not drain your tank and use 3 gallons of straight race gas. Possible you have slight detonation and timing is getting pulled just like you said.

[Nitro]

That 1/4 mph seems right on for your 1/8th mph. I trap 82-84 in the 1/8th, and 103-105 in the quarter. You might be like, a half a mph away from where you should be, but it's not a mind blowing difference.

[tort9320g]

That 1/4 mph seems right on for your 1/8th mph. I trap 82-84 in the 1/8th, and 103-105 in the quarter. You might be like, a half a mph away from where you should be, but it's not a mind blowing difference.

I tend to agree. I'm not sure how much more you should expect up top. Have you talked to otherSRT-4 owners to find out what they're trapping with similar mods ?

Dave

[94RedReaper]

That 1/4 mph seems right on for your 1/8th mph. I trap 82-84 in the 1/8th, and 103-105 in the quarter. You might be like, a half a mph away from where you should be, but it's not a mind blowing difference.

I tend to agree. I'm not sure how much more you should expect up top. Have you talked to otherSRT-4 owners to find out what they're trapping with similar mods ?

Dave

Thanks for all the replies. Yes, I have talked to a few other guys. MOst guys/girls that run that speed in the 1/8, run about 108-109 in the 1/4. I am going to lower the gap. I maybe getting spark blow out. Someone also mentioned that maybe the stock intercooler becomes inefficeint after the 1/8 mile. First I'll try the gap lowered and check the car w/a scanner to check that the timing isn't being pulled.

Thanks

[wgknestrick]

I don't see much wrong with your timeslip. Remember that it is all HP in the last 1/8th. Your good start and time in the 1/8th is just that. You are starting about as fast as you can, getting good traction, you just don't have the hp for a much lower pass. Very good time for a S1.

[03tarmacblack]

I would lower the gaps, your plugs might be blowing out up-top from being gapped so high. Are you tuned?

[94RedReaper]

I would lower the gaps, your plugs might be blowing out up-top from being gapped so high. Are you tuned?

I agree. I lowered them and am checking for any leaks, just in case. I am not fully tuned yet. I have the equipment needed, just need more time. :roll:

[SexyDSM95]

Your problem is that you are FWD...JFWY

I agree your times don't appear to be too off. Tuning will definately play a big key on your powerband and you will hopefully pick up the MPH's.

[03tarmacblack]

I would lower the gaps, your plugs might be blowing out up-top from being gapped so high. Are you tuned?

I agree. I lowered them and am checking for any leaks, just in case. I am not fully tuned yet. I have the equipment needed, just need more time. :roll:

I dont know how well srt-4's handle tuning, but ill tell you something with my evo. Ive had a bunch of parts installed( not to be disclosed) and an afc-2. My dyno run with all parts with afc-2 hooked up but not tuned was harsh. After tuning was all said and done, I picked up 72 hp, and a nice amount of torque, from just tuning fuel, wait until I start messing with timing when I get ems...

[94RedReaper]

I would lower the gaps, your plugs might be blowing out up-top from being gapped so high. Are you tuned?

I agree. I lowered them and am checking for any leaks, just in case. I am not fully tuned yet. I have the equipment needed, just need more time. :roll:

I dont know how well srt-4's handle tuning, but ill tell you something with my evo. Ive had a bunch of parts installed( not to be disclosed) and an afc-2. My dyno run with all parts with afc-2 hooked up but not tuned was harsh. After tuning was all said and done, I picked up 72 hp, and a nice amount of torque, from just tuning fuel, wait until I start messing with timing when I get ems...

I agree w/you about tuning. I just haven't gotten around to doing it yet. I know that the SRT-4's run very rich, so I'll need to lean it out a little. Unfortunately, I spend most of my day fixing other cars and don't get to my own.