new cam and dyno tune= bad results

[hottwheels04]

1st my tuner can not get my car to run right with a new tune, he has burnt several chips and the car still has tons of problems with idle etc,One min it ran fine then next min runs like SH*T, He called me to say that I might have a fried computer and I have to put a new computer unit into my car then put in and try my chip in that computer and hope that fixes my problem.


he said the car was going fine on the dyno but I lost tons of power after my cam swap that something is wrong, and My new cam's rpm range is good for 2,200-6,200,But my problem is its only making 281rwhp @ around 5,000 rpm's, my car before was putting down a steady 330-360rwhp, He also noticed my injector wiring is cracked and was touching so he suggested replacing my injector wiring harness, and maybe a better intake that will allow my cam to break into its power band of 6,000+rpms where it needs to be to make my power with that cam.

Do you think my injector wire problem and computer problem is why my car is losing tons of power? he suggested me ditching my upper street heat intake for a track heat and finding a new piggy back injector wiring from a junk yard etc to replace my and install my new computer and a new chip and put it back on the dyno. so where could I find the injector wire harness and how much $ etc??


My setup as below is

MODIFICATIONS:
stock 95 truck block.
refreshed.
Decked block
bored .30 over ( 306 c.i)
Speed pro hyper pistons notched
(higher compression)
ARP bolts. all around.
Felpro Gaskets all around.
Comp xe274Hr Cam
(Trick flow track heat dual .625 lift valve spring upgrade)
Trick flow Twisted Wedge aluminum heads
CNC PORTED.
Ford Racing 1.6 roller rockers.
Trick flow street heat upper and lower intake manifold.
(port matched lower intake)
edelbrock sn95 intake elbow.
BBK 75mm Throttlebody
mac cold air intake ( k&n filter)
Pro-m 75mm mass air meter.
Ford racing 24lb injectors
automotive fuel regulator
trick flow 255lph fuel pump
ford racing 180 degree t-stat.
aluminum radiator.
bbk underdrive pulleys
MSD distributor / ford racing plugs-wires.
ford racing shorty headers.
bassani bx -x-pipe with hi flow cats
SLP LM1 catback exaust
ford racing 3.73 gears.
Tremec tk0-500 transmission
MGW ORANGE SHORT SHIFTER
spec stage 1 clutch
(ford racing Heavy duty TOB AND HD PILOT BEARING)
spec aluminum flywheel
ford racing aluminum driveshaft
ford racing foxbody style clutchfork
ford racing clutch cable

previous best 2 pulls with smaller cam it put down on a race tune 361rwhp and 320rwtq
on a 93 octane pump tune it made around 330rwhp


Now I put in a new bigger cam and it only put down 281rwhp 313rwtq. and its only making power around 5,000-5,5500 rpms.


The numbers are Horrible!I cant belive that big of a drop in power, the cam should be making power from 5,500-6,200rpms+

I was wondering if the injector wire harness problem and computer could make it run like SH*T yet on the dyno seem fine but only make power @ 5,000 rpms.


Thanks
Jeff


I mean on my stock 130k mile worn out 302 5.0 in my car with the out of the box trick flow heads cam intake on stock compression etc, my car put down 273rwhp and 273rwtq untuned and tune only it put down 300rwhp 310rwtq, now I have a rebuilt 306 with high compression/new pistons, ported trickflow heads and intake, way bigger cam,bigger throttlebody low miles dyno tune etc and it lost tons of power I dont get it and same exact motor / setup just put the new comp cam in and it makes that for power




do the 3 problems of the intake,computer and injector harness sound right to it dropping off @ 5,000 rpms and the horrible power loss? even if the same intake on a smaller cam before would pull to 6,000 rpms and ran fine on the old tune? all the problems he told me it had did sound like a computer problem,So i hope the new computer and retune will fix most the problem

 

[hottwheels04]

ANYBODY?

 

[blkmcnasty]

You should try posting this in the 94-95 specific section. I bet Addermk can help you.

 

[hottwheels04]

You should try posting this in the 94-95 specific section. I bet Addermk can help you.

THANKS

 

[wytstang]

Did you check pushrod length when you swapped the cam? or just reused the PR you had with out checking?

 

[RossA81]

What the hell dyno were you on where it said you were putting down 330+ ??

That is the issue you here... your basic H/C/I 306 is not gonna put out much more than 300 rwhp...

Sounds like the guy doing your tune does not know what he is doing but the reality is that you are now you are seeing the real numbers....

Ross

 

[hottwheels04]

Did you check pushrod length when you swapped the cam? or just reused the PR you had with out checking?

I checked that for sure and had to check piston to valve clerance

 

[hottwheels04]

What the hell dyno were you on where it said you were putting down 330+ ??

That is the issue you here... your basic H/C/I 306 is not gonna put out much more than 300 rwhp...

Sounds like the guy doing your tune does not know what he is doing but the reality is that you are now you are seeing the real numbers....

Ross

This is true for out of the box basic heads cam intake on a stock 5.0 stock compression, if u do ur research bigger heads/ port work /higher compression or a bigger cam like I have guys make 300-350rwhp all day on 306/331 c.i setups, and 350-400rwhp with same setup on strokers, 270-300rwhp is what my car made with basic setup on my stock motor, but after doing a new fresh motor port work bigger cam etc should = some kind of gain in power, not a loss and makeing same or lower power. Several guys with same setup as me over on stangnet and other sites have posted 320,330,340rwhp,which is what my car was making before with same exact motor just with a smaller cam.

 

[wannaboost94gt]

What the hell dyno were you on where it said you were putting down 330+ ??

That is the issue you here... your basic H/C/I 306 is not gonna put out much more than 300 rwhp...

Sounds like the guy doing your tune does not know what he is doing but the reality is that you are now you are seeing the real numbers....

Ross

This is true for out of the box basic heads cam intake on a stock 5.0 stock compression, if u do ur research bigger heads/ port work /higher compression or a bigger cam like I have guys make 300-350rwhp all day on 306/331 c.i setups, and 350-400rwhp with same setup on strokers, 270-300rwhp is what my car made with basic setup on my stock motor, but after doing a new fresh motor port work bigger cam etc should = some kind of gain in power, not a loss and makeing same or lower power. Several guys with same setup as me over on stangnet and other sites have posted 320,330,340rwhp,which is what my car was making before with same exact motor just with a smaller cam.

331 is a stroker lol... :tongue3:

 

[wannaboost94gt]

But honestly your numbers before the swap are a bit high and after the swap are a bit low IMO. It should be in the 315+rwhp range now I would think but no way was it 330-360 rwhp before. :tard:

 

[wannaboost94gt]

I do like the cam tho. :thumbsup:

 

[hottwheels04]

I do like the cam tho. :thumbsup:

I liked it to, a guy I kno with trickflow 205cc heads trickflow R and same cam made 420rwhp on a 331 c.i in his car,I thought I would be happy but the numbers with this cam on my car is making me sad lol It should be 300-325rwhp easy with this cam which is the norm for this cam, but my luck is I have the record setting 281rwhp worlds lowest numbers every made for this cam lol

 

[wannaboost94gt]

I wouldn't give up hope yet. :angel4:

 

[Sinned83]

Sounds like you should put the old cam back in.

I think you are cursed cause you live in New England and like the Yankees

 

[hottwheels04]

I wouldn't give up hope yet. :angel4:

Thanks man

 

[hottwheels04]

Sounds like you should put the old cam back in.

I think you are cursed cause you live in New England and like the Yankees

Lol I was waiting for you to chime in man! Dam redsux fans haha jk lol

 

[MustangChris]

sounds like you should take it to a track... .. see if it runs better.... everyone is thinking the old numbers were high. well, maybe they were... does it go from a 13 to a 12, even with lower numbers? if so, your first shop had a bad dyno. :-/

 

[NoMercy94]

there is nothing wrong with that cam...it pulls to 6500 on my hi comp 306 . i think u have another problem... its sound to me like the computer is probably pulling alot of timing out at high rpms and thats why it peaked at 5 grand .... judging bye how much hp u made at 5k u should make about 325 or so at 6k im guessing ..... i love my xe274hr but i would get the next bigger one if i did it over xe282 i think

 

[hottwheels04]

there is nothing wrong with that cam...it pulls to 6500 on my hi comp 306 . i think u have another problem... its sound to me like the computer is probably pulling alot of timing out at high rpms and thats why it peaked at 5 grand .... judging bye how much hp u made at 5k u should make about 325 or so at 6k im guessing ..... i love my xe274hr but i would get the next bigger one if i did it over xe282 i think

Thanks! yeah I'm glad to hear that from some 1 else with the same cam,yeah i was guessing 281rwhp @ 5k would be around 320-330rwhp @ 6-6,200. Tommrow my new computer should be coming in so I hope after he puts that in it will run so then I can swap out my upper intake to a track heat and redyno hope it makes power @ 6k, sounds about right and makes sense,wish me luck.

Thanks for all the input guys

 

[hottwheels04]

Heres 1 of my new dyno charts with the low numbers :BangHead:

Heres what it should look like if it would make power in the 6,000-6,500 range, these are similar setups with same trick flow heads and same size cams.

:dontknow: