200MPH Mustang GT
Discussion
CraigJ said:
It’s a handful in the dry.
1st and second are useless for wide open throttle. No traction at all. 3rd on is ok in dry with warm tyres.
We have a racecar with similar power/weight ratio to your Mustang. Starts working properly over 80mph but has significant advantage over 100mph. Happy motoring 1st and second are useless for wide open throttle. No traction at all. 3rd on is ok in dry with warm tyres.
Well a slightly disappointing day on the dyno this morning.
Last time the car ran 632hp at the wheels and 577lbft of torque.
Today we only managed 638hp at the wheels but we did manage a nice increase in torque of 40lbft so now at 617lbft at the wheels.
The heat today didn't help and the car only managed 12psi as opposed to 14psi with IAT's of 43c
The car is much nicer to drive though with the power delivery being much more linear where as before it would come in with a bit of a hit.
Peak hp was also much lower at about 6300rpm vs 7400rpm last time making it more accessible.
Not sure what to do now, either just keep it as it is or go long tube headers, free flowing cats and larger injectors or sell the car and move onto the next project.
Last time the car ran 632hp at the wheels and 577lbft of torque.
Today we only managed 638hp at the wheels but we did manage a nice increase in torque of 40lbft so now at 617lbft at the wheels.
The heat today didn't help and the car only managed 12psi as opposed to 14psi with IAT's of 43c
The car is much nicer to drive though with the power delivery being much more linear where as before it would come in with a bit of a hit.
Peak hp was also much lower at about 6300rpm vs 7400rpm last time making it more accessible.
Not sure what to do now, either just keep it as it is or go long tube headers, free flowing cats and larger injectors or sell the car and move onto the next project.
CraigJ said:
Well a slightly disappointing day on the dyno this morning.
Last time the car ran 632hp at the wheels and 577lbft of torque.
Today we only managed 638hp at the wheels but we did manage a nice increase in torque of 40lbft so now at 617lbft at the wheels.
The heat today didn't help and the car only managed 12psi as opposed to 14psi with IAT's of 43c
The car is much nicer to drive though with the power delivery being much more linear where as before it would come in with a bit of a hit.
Peak hp was also much lower at about 6300rpm vs 7400rpm last time making it more accessible.
Not sure what to do now, either just keep it as it is or go long tube headers, free flowing cats and larger injectors or sell the car and move onto the next project.
I’d say that’s a good result. From what I’ve read, 600 whp/750 fwhp is the limit of stock pistons and from my own experience of the TVS2300, 830 fwhp (tested on an engine dyno) is about all it has to give in terms of airflow. One thing I do know is when a piston lets go, it makes one hell of a mess! Last time the car ran 632hp at the wheels and 577lbft of torque.
Today we only managed 638hp at the wheels but we did manage a nice increase in torque of 40lbft so now at 617lbft at the wheels.
The heat today didn't help and the car only managed 12psi as opposed to 14psi with IAT's of 43c
The car is much nicer to drive though with the power delivery being much more linear where as before it would come in with a bit of a hit.
Peak hp was also much lower at about 6300rpm vs 7400rpm last time making it more accessible.
Not sure what to do now, either just keep it as it is or go long tube headers, free flowing cats and larger injectors or sell the car and move onto the next project.
Also I wouldn’t get too hung up on dyno numbers. If you swap that hub dyno for a run at SRR, you might lose 10-15%
Edited by anonymous-user on Monday 5th August 17:55
Edited by anonymous-user on Monday 5th August 17:56
Couple of pictures from a few weeks ago.
New injectors arrived but still haven't had the time to fit them yet.
These are 72lb whipple injectors and will replace the current 52lb set.
Also had a sub-frame support brace kit arrive which i got bolted on in an hour. This will help keep the rear sub-frame in touch and help reduce wheel hop.
Just a shot of the blower
Nice moody shot after a wash and polish
I have also moved back up to a 3 inch pulley for the winter to help with the power delivery. Still 725bhp+ & 670lbft I can now use a few more revs off boost for normal driving.
But with the wet weather right now it still just spins the wheels as soon as the boost comes in if your not careful.
Hoping to take part in a speed event next week at Elvington.
There 0-60, 1/4 mile etc but i'm interested in the top speed runs and rolling starts.
New injectors arrived but still haven't had the time to fit them yet.
These are 72lb whipple injectors and will replace the current 52lb set.
Also had a sub-frame support brace kit arrive which i got bolted on in an hour. This will help keep the rear sub-frame in touch and help reduce wheel hop.
Just a shot of the blower
Nice moody shot after a wash and polish
I have also moved back up to a 3 inch pulley for the winter to help with the power delivery. Still 725bhp+ & 670lbft I can now use a few more revs off boost for normal driving.
But with the wet weather right now it still just spins the wheels as soon as the boost comes in if your not careful.
Hoping to take part in a speed event next week at Elvington.
There 0-60, 1/4 mile etc but i'm interested in the top speed runs and rolling starts.
CraigJ said:
bigdog3 said:
Much kinder on the transmission
More the clutch lol. Still on the standard clutch and launching it will definitely wreck it.
wormus said:
Keep an eye on your IATs if you are going long periods at WOT, say over the mile. The Intercooler can struggle to keep up with detonation/predictable results. Power Pour fuel additive is very good protection.
Have you considered doing track days on racing circuits? That will reveal any deficiencies in cooling. You might need a diff cooler 
bigdog3 said:
wormus said:
Keep an eye on your IATs if you are going long periods at WOT, say over the mile. The Intercooler can struggle to keep up with detonation/predictable results. Power Pour fuel additive is very good protection.
Have you considered doing track days on racing circuits? That will reveal any deficiencies in cooling. You might need a diff cooler Saying that I will be keeping an eye on temps during the day.
No plans to track it. Only doing this event just to see what the car will do in a safe environment.
CraigJ said:
The kit handles heat soak quite well, one of the reasons I picked it.
Saying that I will be keeping an eye on temps during the day.
Very wise. It’s not the heat soak (from standing still) that gets them, same design as the Maggie heartbeat blowers, the intercoolers are very good for normal driving. What you’ll see however is prolonged use flat out generates a huge amount of heat and the intercooler circuit gets overwhelmed. Larger water tank and faster pump help but it’s not practical for just one day’s use. At Bruntingthorpe I was seeing IATs in the low 200 deg F towards the end of each run. No detonation though because of the fuel additive and of course the map, if done well is designed to pull timing as IATs climb to keep everything safe. Scan gauges are a good idea. Saying that I will be keeping an eye on temps during the day.
CraigJ said:
No plans to track it. Only doing this event just to see what the car will do in a safe environment.
A few modern Mustangs turn up at track days but invariably crawl round at low speed - never sure whether that's the drivers or the cars. Hoped you were going to buck the trend.It's a shame because many historic racing Mustangs (mid-60s with 289ci power) are remarkably quick. But then so is 2000MY Cobra R
Right so the Speed event didn't take due to being double booked or some thing but it has now been confirmed for the 25th so i'm still taking part.
In the mean time i had the chance to get a few bits done to the car.
First job was to get the injectors swapped out for the 72lb's and flash the ecu with the new injector parameters.
Not many pics of this as i just forgot to take any.
I decided to work on the intake setup to try and help with IAT's. The Edelbrock intake is a sealed box but it didn't have any seals to keep out hot engine bay air. So a bit of foam tape ordered up and put around the MAF housing and the lid.
While I was at it I ordered a Velossa tech big mouth and refitted the standard grille but opened up the grille more to allow better airflow. This is more to help prevent backwash from the rads.
I also added a black pony badge to get rid of the chrome. US spec lower grille that i had in the garage for a while finally went on to match the upper grille.
Full set of pads but only swapped the fronts. Rears were still like new so just gave them a clean up. No more squeal and they bite nicely.
For the best part of 20 years i have always worked on my own cars on trolley jacks and stands and always wanted a lift but never had the space for one.
My current Garage is now much larger then the previous one by being about 1.5m wider and almost twice as long so i finally have space for some sort of lift.
A 2 post isn't really possible due to hight. I'd be able to lift but not able to walk under so I saw these lifts on different forums and had a look in my nearest Costco.
12v powered so it can run the car you are working on or a spare battery. Makes it quite portable.
Very happy with it.
In the mean time i had the chance to get a few bits done to the car.
First job was to get the injectors swapped out for the 72lb's and flash the ecu with the new injector parameters.
Not many pics of this as i just forgot to take any.
I decided to work on the intake setup to try and help with IAT's. The Edelbrock intake is a sealed box but it didn't have any seals to keep out hot engine bay air. So a bit of foam tape ordered up and put around the MAF housing and the lid.
While I was at it I ordered a Velossa tech big mouth and refitted the standard grille but opened up the grille more to allow better airflow. This is more to help prevent backwash from the rads.
I also added a black pony badge to get rid of the chrome. US spec lower grille that i had in the garage for a while finally went on to match the upper grille.
Full set of pads but only swapped the fronts. Rears were still like new so just gave them a clean up. No more squeal and they bite nicely.
For the best part of 20 years i have always worked on my own cars on trolley jacks and stands and always wanted a lift but never had the space for one.
My current Garage is now much larger then the previous one by being about 1.5m wider and almost twice as long so i finally have space for some sort of lift.
A 2 post isn't really possible due to hight. I'd be able to lift but not able to walk under so I saw these lifts on different forums and had a look in my nearest Costco.
12v powered so it can run the car you are working on or a spare battery. Makes it quite portable.
Very happy with it.
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