Top Speed still a dog... and a mystery

MB- 86CGT · 03-12-2003, 02:48 AM

Just like a couple of weeks ago when several of you helped out, in 4th and 5th gears the engine creeps up inn spedd - it doesn't pull the car - I remember that years ago when the engine was rebuilt/modified (and before some mechanic messed with the fuel distributor forcing me to get a new one) the car had great top speed +125mph. ...And based on your feedback, I agree there is definitely something wrong...
Here is what has been done.
1) New coil and plugs 3 prong (not plats)and repeated adjustment of the distributor
2) The mechanic shunted the cold start injector with the full throttle switch.
3)Installed a free flow K&N filter and directed the air intake hose to the grill.
4) tweaked the screw (1/2 turn) on the pressure regulator.
Each of these has contributed to make the car quicker through the gears - but in top speed doesn't clear 100-105mph (in Portugal, you can still get away with this).

Is there some electronic switch/ sensor which could be holding the car back ? ... the full throttle switch ... any checks we should run with the fuel system ?
Thanks

gmbchef · 03-12-2003, 05:53 AM

Have you done a timing belt change since the mods? Belt could be off a tooth, or it may have just jumped a tooth.
HTH

MB- 86CGT · 03-12-2003, 06:23 AM

MB- 86CGT · 03-12-2003, 06:45 AM

He had already checked that possibility - it's OK.
Since this project (bringing the car back to life)over the last year, many components were regularly renewed.
He changed the injectors - said he used the quattro reference for these... so theys hould be OK ?

The other was the fuel pump - if he put one in for a 110 hp KX engine, could it now be insufficient ?

Dwight V. · 03-12-2003, 07:02 AM

Injectors and fuel pump from the KX work fine with my 2.3.

MB- 86CGT · 03-12-2003, 07:26 AM

...with your help , I'm confident we'll find the problem.

For all who read this...
Just for benchmarking purposes... How fast do your CGT's go ?

StormChaser404 · 03-12-2003, 08:10 AM

Whitjr · 03-12-2003, 08:43 AM

TundraCGT · 03-12-2003, 08:57 AM

I've only taken mine up to 108mph so far. I seem to have a bit of a shimmy at the upper range so I backed off as it became more pronounced at that speed.

CGTBrad · 03-12-2003, 09:11 AM

03-12-2003, 05:53 AM	#2
gmbchef AudiWorld Senior Member Garage is empty, add now Join Date: Nov 2001 Posts: 3,331	Re: Top Speed still a dog... and a mystery Have you done a timing belt change since the mods? Belt could be off a tooth, or it may have just jumped a tooth. HTH

03-12-2003, 06:23 AM	#3
MB- 86CGT New Member Garage is empty, add now Join Date: May 2002 Posts: 62	The belt was removed when the engine was put in...I'll have it checked it ASAP. Thx. __________________ 86 CGT (in Portugal) 180hp re-worked head,big valves, pistons, cam, 5-3-1 custom exhaust rear disk upgrade 16" RONAL wheels w/ 225/45 tires leather interior Eibach springs/ Bilsteins Dual exhaust

03-12-2003, 06:45 AM	#4
MB- 86CGT New Member Garage is empty, add now Join Date: May 2002 Posts: 62	gmbchef - I just spoke to the mechanic ... re. the belt He had already checked that possibility - it's OK. Since this project (bringing the car back to life)over the last year, many components were regularly renewed. He changed the injectors - said he used the quattro reference for these... so theys hould be OK ? The other was the fuel pump - if he put one in for a 110 hp KX engine, could it now be insufficient ? __________________ 86 CGT (in Portugal) 180hp re-worked head,big valves, pistons, cam, 5-3-1 custom exhaust rear disk upgrade 16" RONAL wheels w/ 225/45 tires leather interior Eibach springs/ Bilsteins Dual exhaust

03-12-2003, 07:02 AM	#5
Dwight V. Member Garage is empty, add now Join Date: Sep 2000 Posts: 2,275	Fuel Injectors and fuel pump from the KX work fine with my 2.3. __________________ Dwight Varnes 1986 Coupe GT, 150hp 2.3 with Schrick cam, Audi 90 rear disc axle, 4kq front sway bar, Addco rear bar, 2.25" exhaust with Bullit muffler, 16" Team Dynamics wheel package, H&R springs, anthracite w/leather, owned since 1993, SOLD! 2006. Buildup shown on http://www.mongrelmotorsports.homestead.com . Now racing a BMW :( SAVE MY CAR! Current owner may wish to sell. Paint is bad. Engine still nearly new. Email me for contact info.

03-12-2003, 07:26 AM	#6
MB- 86CGT New Member Garage is empty, add now Join Date: May 2002 Posts: 62	Re: Fuel - OK.. don't quit on me now... ...with your help , I'm confident we'll find the problem. For all who read this... Just for benchmarking purposes... How fast do your CGT's go ? __________________ 86 CGT (in Portugal) 180hp re-worked head,big valves, pistons, cam, 5-3-1 custom exhaust rear disk upgrade 16" RONAL wheels w/ 225/45 tires leather interior Eibach springs/ Bilsteins Dual exhaust

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03-12-2003, 08:10 AM	#7
StormChaser404 Member Garage is empty, add now Join Date: Sep 2000 Posts: 4,325	Had my 87.5 (130hp, NG code engine) up to 110, got scared and backed off... __________________ Dave My former Audi: 1987 Coupe GT Special Build 2.3 (H4s, custom exhaust, Borbet Type Es with Yoko AVS ES100s tires, Recaro Trophy seats, Euro 90 Sport 3 spoke steering wheel, 4Kq swaybar, Boge TurboGas struts/shocks, Eibach springs from a Typ89 sedan, Kenwood Bazooka & Blaupunkt stero system, R134a converted AC blowing 34*F, 35% metalic charcoal tint, fresh paint in original Anthracite Black) 2003 Infiniti G35 1993 RX7 - R1 (shared toy, stock)

03-12-2003, 08:43 AM	#8
Whitjr AudiWorld Super User Garage is empty, add now Join Date: Oct 2002 Location: Gibsonville, NC Posts: 6,248	Have U compression tested those cyl.s? Ever had any probs w/ oil system? __________________ Ray, in NC: 2001 A-6 Quattro: Casablanca White, w/black leather interior. 2.8Ltr non-turbo 30 valve dual OHC six cyl, cold weather package, dual exhausts, moonroof/sunroof, Audi symphony console stereo w/8 bose speakers, OEM 16" wineglass ronal rims, individual climate controlls, frt and rear anti-sway bars, anti-theft package, upgraded front suspension. The family ride. This car kills the newer Impalahhhhs, honduhs, hyundahassss, and pretty much everything GM, Chrysler, and Ford makes. 1984 4000-S [non-quat], black re-paint , 1.8ltr 4 cyl, KYB struts front and back, front and rear anti-sway bars, OEM Audi Radio [Blaupunckt], CD player w/ MB Quart speakers, OEM 13" ronal snowflake rims. 395,865 miles and counting, 31 mpg on combined city/hgy mileage. The old boy is back on the road! Portable automotive security system for above cars provided by a big white German Shepard!!

03-12-2003, 08:57 AM	#9
TundraCGT New Member Garage is empty, add now Join Date: Dec 2002 Posts: 92	Re: How fast? I've only taken mine up to 108mph so far. I seem to have a bit of a shimmy at the upper range so I backed off as it became more pronounced at that speed. __________________ 87.5 CGT Special Build Alpine White w/Grey and black interior 83500miles when I bought it! 5spd Other toys: 85 Ninja 85 Sea Ray Seville 19' 97 Subaru Legacy GT (Wifes) 91 Volvo 740 Turbo!

03-12-2003, 09:11 AM	#10
CGTBrad AudiWorld Super User Garage is empty, add now Join Date: Jul 2002 Posts: 8,994	Ditto - My car gets shakey above 105 __________________ ---------------------------------------- Brad B. Nashville 1987.5 CGT 2.3 Special Build 2001 TT 225

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