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#1 |
Registered Member
Join Date: Jan 2007
Posts: 3
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![]() Here is a run down of the Mods I was told were done:
bored out 30 thousands Motorsport roller cam & roller lifters (282 duration, 498 lift) complete head rebuild (shaved 10 thousands) stock headers (They are not, they look like long pipes) Flowmaster exhaust with H Pipe no cats Hypertech chip K&N drop in air filter World Class T5 In the paperwork I recieved I found some info. Grind Number M-6250-E303 Rocker Arm Ratio: 1.60 Max Lift Intake and Exhaust 110 for both Cam Lift .311 (Int and Exh) Valve Lift .498 (Int and Exh) Cam Timing @ .004 Tappet Lift: Intake Opens 28 BTDC Closes 74 ABDC Dur 282 Exhaust Opens 68 BBDC Closes 34 ATDC Dur 282 Cam Timing @ .050 Tappet lift: Intake Opens 0 BTDC Closes 40 ABDC Dur 220 Exhaust Opens 40 BBDC Closes 0 ATDC Dur 220 The car is SLOW, I thought so before but have been driving faster cars and thought maybe my memory was off. Today on the way home a ratty Neon with dual exhaust and fart cans was lined up at the light, I could just barely beat him and his exhaust smoked at each take off like the rings were shot. The car sounds good, but never seems to kick down or throw you back at all. For now I just want to get it running right, (at least as fast as stock) after awhile I can look into other mods. It also idles between 1000 and 1500, I mean it goes up and down. Also while driving if the RPM's are below 2000, the car kind of jerks or surges. Any ideas what to check? It sounds like Speed Density problems from what I read. Also how do I know what fuel injectors I have? Mine look yellow or orange. (I'm truly "color deficient" I can see colors but varying shades of the same color look the same) Thanks, __________________ Sam Woodson Harvest, AL 1986 Mustang GT Convertible 5spd |
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#2 | |
Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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![]() Quote:
The surging and high idle is probably the speed density ECU not liking the E303 cam. Get a fuel pressure regulator and set the fuel pressure, set the TPS voltage and make sure your car is set at 10 degrees initial timing since you have a chip. You may want to also do a compression to test to determine the health of your engine. The cam isnt helping at all with the parts you have so other than the exhaust your car is pretty much stock. I wouldnt expect a basicly stock 1986GT convertible to be very fast, at least not until you get some real mods. I used to have a 1988 GT convertible 5 speed and it ran a 15.40 @88mph bone stock which isnt very fast. BTW: the yellow injectors are the stock 19#ers. Good luck,
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
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#3 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() Did the 86 have the lame flatop pistons dark5.0? I cant remember, but with the heads shaved and an e-cam the clearance is too close, and will cause problems.
Almost sounds like your describing a neon srt-4? if so those things are pretty quick, if it wasnt, then dont ever race one until you get your problems figured out. I would dyno it, a guy in the dyno shop could probaly point you in the right direction. if you do have 86 heads then get rid of them if you want to see any power.
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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#4 | |
Registered Member
Join Date: Jan 2007
Posts: 3
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![]() Quote:
As far as clearance goes, it's been running since 2000 like this, about 30k miles. Per the PO Others are telling me to go MASS Air, the Speed Density can't handle this cam, not enough Vacum. SD would be cheaper and easier than going to a new cam and would be beneficial down the road. That's the way I'm leaning for now, unless someone has a reason not to. Thanks, |
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#5 | |
Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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![]() Quote:
On the other had I much prefer mass air.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
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#6 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() I knew a guy with an 85 coupe, he drove the car for a while before he tore down the motor to find out the pistons were hitting the valves at times,(had nos) there was no noise.
Im not saying you have this problem, just saying you might not always know right away if your making contact with the valves. On another note, no one mentioned the gear situation? do you have 2.73's? if so, throw some 4.10's in that thing!!! ![]() that cam needs at least a 3.55 gear to make up for the lowend loss, it will feel like a dog otherwise.
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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#7 |
Registered Member
Join Date: Jan 2007
Posts: 3
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![]() It has the 2.73 rear end with the World Class T5 that is geared better, but it really runs out of breath. I wonder what the computer is doing to make it so slow. The 86 had limited things to control. The PO said he advanced the timing as much as he could for better performance, but it's severely lacking in power.
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#8 |
Registered Member
Join Date: Mar 2000
Location: Berwick,Pa
Posts: 127
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![]() i hate to reiterate what coupe50h said but i think it is necassary in this case. you absolutely need gears. i am currently running an ecam with edelbrock heads, but before that i was running the car with ported e7's and it ran high 13's all day and night (with 3.73) gears. my buddy had a similar setup and he was only running 273's. his car didn't stand a chance. to really hammer this point home, another friend with similar setup has 4.10's and still can't catch him. DON'T FEAR THE GEAR!
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'89 GT hatch back performer rpm intake, performer rpm cylinder heads, fms e-303 cam, kirban adj fp regulator, holley 65mm tb, harland sharp 1.6 roller rockers, alum driveshaft, 3.73 gears (283 rwhp, 303 rwtq new numbers with new heads) |
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#9 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() In this case even a 3.27 gear would help, i ran these for a while with the e-cam, I made up for the lack of gear with a 5k launch on slicks
![]() Other than that, a dyno session is necessary to see what rpm it's falling on it's face at, then figure out why? Some dyno shops can tell you whats wrong, right away by how the power curve looks, and compared with the a/f ratio. good luck.
__________________
X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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