IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: Shimy87 on September 30 2018, 08:51:55 PM

Title: M&H racemaster dr's
Post by: Shimy87 on September 30 2018, 08:51:55 PM
If your considering them, my advice is dont!! Street tires hook just as good. Tried them because they were the only company that made a 17 inch that was 28 inches tall. With my 26 inch tall Nittos I had 1.6 60 ft times and could leave with 10-14 lbs boost and hook. These let go on 2 lb launches and my best 60 ft of the day was 1.98........tr ied from 18 lbs air and dropped down to 14 and still no traction. Very disappointed!!
Title: Re: M&H racemaster dr's
Post by: Steve Wood on September 30 2018, 08:59:17 PM
Did you warm them up enough?
Title: Re: M&H racemaster dr's
Post by: Shimy87 on September 30 2018, 09:10:28 PM
Tried everything from long burnouts to just a quick" clean em off"  spin. They were worse hot which I thought was weird but my Nittos hooked best after a short burn out also. Other thing that bummed me out was with the 26 inchers my 1/4 MPH was 108 with the 28's same 108MPH. My et also suffered..... from 12.1 to 12.4 but that's cause my 60 ft sucks now
Title: Re: M&H racemaster dr's
Post by: Scoobum on October 01 2018, 06:44:06 AM
You're not picking up MPH cuz the convertor in your car sucks. This tire thing...is getting old. Grab a pair of used 28 by 9 MT slicks...and any old used pair of GM 8 inch rims with something near a 4 inch backspace.
Title: Re: M&H racemaster dr's
Post by: TexasT on October 01 2018, 06:51:48 AM
What did the track do to prep? If this was a test n tune activity, I doubt much unless some of the big names showed up. If it was a bunch of street cars with treaded tires you can't expect to get much from the track.
Title: Re: M&H racemaster dr's
Post by: Grumpy on October 01 2018, 10:34:01 AM
I use the 16"/28".. Only ones I could get in 16's. work fine for my car. Can only get 0 psi with the damm brakes. High 1.5s /low 1.6s.. Trying to get the brakes workin better for Oct 31st.. Last track day locally.
Title: Re: M&H racemaster dr's
Post by: reality on October 01 2018, 10:43:55 AM
Tried everything from long burnouts to just a quick" clean em off"  spin. They were worse hot which I thought was weird but my Nittos hooked best after a short burn out also. Other thing that bummed me out was with the 26 inchers my 1/4 MPH was 108 with the 28's same 108MPH. My et also suffered..... from 12.1 to 12.4 but that's cause my 60 ft sucks now
 




Can you post the 2 time slips/? or just put the numbers on them up.
Title: Re: M&H racemaster dr's
Post by: Steve Wood on October 01 2018, 02:26:08 PM
I thought the M&H's had a pretty soft compound so I would have expected them to bite harder.  Nitto's don't like to be overheated but I would have thought the M&H's would like a bit more warm up.  An old rule of thumb says to heat them until the smoke turns from white to light gray and stop at that point.

On a 12 sec car, I would not expect much increase on the top end mph but the longer footprint would be expected to improve the short times a little as there is more rubber on the track at one time during the leave.

That takes us back to the track surface condition assuming the 28" M&H's are new tires and the rubber is soft on them.

Was it only you having difficulty with the short times?
Title: Re: M&H racemaster dr's
Post by: Shimy87 on October 01 2018, 02:31:18 PM
try to cover all replys here
Scoob....consi dered converter replacement and called Jack Cotton to buy one...he recommended the tire option first
Texas.....its a "muscle car" day so quite a bit of track prep and maintenance thru day, same track prep that the nitto's had run on
Grumpy....how much air do you use and what burnout to get them to hook
reality....sli ps at home, will try to put them up
Steve....tires are brand new, some hooked and some didn't, it was a cold day, no sun and about 50 degrees

Title: Re: M&H racemaster dr's
Post by: Steve Wood on October 01 2018, 04:49:00 PM
Almost sounds like it needed more air, to me.  The tires may have been squirming. Have you googled for comments about them?

Title: Re: M&H racemaster dr's
Post by: Grumpy on October 01 2018, 05:37:51 PM
18#s.. maybe 5 sec an drive forward.
Title: Re: M&H racemaster dr's
Post by: Steve Wood on October 01 2018, 06:14:58 PM
18#s.. maybe 5 sec an drive forward.

Might try a different pressure gauge as well.  Some of them can be way off.
Title: Re: M&H racemaster dr's
Post by: TexasT on October 01 2018, 06:25:30 PM
Have you tried other pressures on the street? Other burn outs, length, speed? These are new and will need to be workedd on for an optimal result.

Any time I hear "oh, there were lots of cars", then you say muscle car day and I think treaded tires tearing up "the groove". And then you say it was cold out. Recipe for no hook.
Title: Re: M&H racemaster dr's
Post by: Shimy87 on October 02 2018, 05:21:54 PM
Called M&H for some info. They said 17-18 lbs at the track, about 3 second burnout, don't overheat them. Told him my 26 inch Nittos hooked great, he thinks my rear set up was good for the 26 inchers but now its off for a 28 inch tire. I didn't check my sway bar angle with these but who knows. On line reviews most people really like these and they hook well with cars with a lot more HP than I'm dishing out so its gotta be me or the car set up
Title: Re: M&H racemaster dr's
Post by: nocooler on October 02 2018, 06:40:06 PM
I’d say track prep, radials are inconsistent on marginal tracks. Did you verify you tire pressure with another gauge?

I know it sounds stupid, but did you try hitting it with more power?
Title: Re: M&H racemaster dr's
Post by: Steve Wood on October 02 2018, 06:49:46 PM
If you went from 26" to a 28" tire, you effectively went to a higher gear and lowered the torque to the ground.  That means it will be harder to spin the tire relatively speaking.  Yet,  you say they were getting blown away at much lower boost.  That is not a torque converter problem and it is not a tire size problem....

Again, I suggest verifying tire pressure with another gauge and trying them again on another surface...mayb e on a warmer day if that comes about.
Title: Re: M&H racemaster dr's
Post by: TexasT on October 02 2018, 07:21:30 PM
Bolt em on and head out to your favorite deserted strip of road and lay down some rubber and back to it and see what you can get it to do with different launches. High boost, low boost, no boost, high rpm and some boost, wind it out and let her rip. Then change the pressure and do those things again. Keep a notebook if you are like me so you know where you are.

I've had good experiences with the brand but haven't done the radials so I'm not even sure what they need to hook. That is up to you to find out.
SimplePortal 2.3.7 © 2008-2024, SimplePortal